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Fitting Omega 1109 Movement into a Seamaster Diver 300M Titanium Case (210.90.42.20.01.001)

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Hello everyone,

I am working on a project to fit an Omega 1109 movement into a Seamaster Diver 300M Titanium case (reference 210.90.42.20.01.001). I have a few questions and would appreciate any advice:

  1. Is the Omega 1109 the right movement for this project, or should I consider a different movement that might fit better with fewer modifications? 8800 series movements are basically impossible to find, another option is the asia clone A8800s but idk where you’d even buy it (I could extract the movement from a same sized watch that I have).

  2. The case is designed for a larger movement (up to 37.7mm). What type of movement spacers or holders would I need to fit the 25.6mm Omega 1109 movement securely?

  3. The original dial for the Omega 1109 might be too small for the larger case. Should I consider a custom dial, and if so, what size should it be?

Thank you in advance for your help!
 
padders
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So you want to put an 1109, which is in effect an ETA 2892 into the NTTD? How have you come by a NTTD that needs a movement? Assuming you have a complete watch with a ruined 8806, might it not be more sensible to send what you have to Omega for an official service and pay whatever they see fit for parts replacement?

The 8806 is the same 26mm diameter as the 2892/1109 by the way, which might help. Not sure where you got the 37.7mm figure from, is that how wide the case measures internally? There are sources that say the 8800 is 29mm, but that is confusion caused by the 8800 appearing to be in the same family as the 8500/8600/8900. It is not.
Edited:
 
O
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I have yet to receive the case, the seller has specified that it can fit up to a 37.7mm movement but i need to actually measure this myself
 
padders
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And this is a legit titanium NTTD case? What I mean is that you are sure it isnt a Chinese copy of some kind, as that would open a world of pain I would have thought. If not, maybe a 1109 might be persuaded to work but it is a solid might.
 
O
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padders padders
And this is a legit titanium NTTD case? What I mean is that you are sure it isnt a Chinese copy of some kind, as that would open a world of pain I would have thought. If not, maybe a 1109 might be persuaded to work but it is a solid might.

Yes, it looks like a legit NTTD case. The machining, surface finish, and other details make me confident it is a legit case. Although, I have not gotten it in yet (only then I will know for sure).
 
padders
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Well best of luck. It certainly sounds like an interesting project!
 
Archer
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O obnauticus
Yes, it looks like a legit NTTD case. The machining, surface finish, and other details make me confident it is a legit case. Although, I have not gotten it in yet (only then I will know for sure).

How much did this case cost you? Is it brand new as a spare part or a case from a wrecked watch?
 
O
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Archer Archer
How much did this case cost you? Is it brand new as a spare part or a case from a wrecked watch?

$300. I ended up canceling the order. It’s brand new.
 
dsio
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O obnauticus
$300. I ended up canceling the order. It’s brand new.
It’s counterfeit, quite clearly. There is no way to get that case for $300 authentically. Don’t buy fake garbage off shady online sellers, if you want a nice titanium Seamaster there are good options around the $2k mark for a real watch.

https://www.ebay.com/itm/395464596911
 
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Archer
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O obnauticus
$300. I ended up canceling the order. It’s brand new.

Since that is a roughly $3,500 US case, I think it's pretty obvious it's fake.
 
O
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O obnauticus
$300. I ended up canceling the order. It’s brand new.

I actually don’t think so. Look at the oring and surface finish compared between these two:
https://www.ebay.com/itm/2261203347...5xvtkg4sck&var=&widget_ver=artemis&media=COPY

https://www.bssysu.com/1945.html

Chinese one looks a lot more rough, less undercuts overall. Plus none of the fake ones have the silicon gasket on the He valve.
 
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Archer
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O obnauticus
I actually don’t think so. Look at the oring and surface finish compared between these two:
https://www.ebay.com/itm/2261203347...5xvtkg4sck&var=&widget_ver=artemis&media=COPY

https://www.bssysu.com/1945.html

Chinese one looks a lot more rough, less undercuts overall. Plus none of the fake ones have the silicon gasket on the He valve.

From the eBay ad:

"This is an empty case without glass or back cover but comes with a matching helium escape valve.

This item comes from a parts dealer in Switzerland."

So this is not a case - it's the case frame, or the middle part of the case, but with the HEV fitted. This case frame is not sold separately, and the only way to get it is to buy a full case, and remove all the other parts from it.

So someone would have to spend $3,500 on a case (2 actually as the seller has 2), remove the case backs, bezels, crystals, then heat the case tube up and remove that (but leave the HEV in place for some reason, unless you want a $100 discount), all to sell the case frame for $300. This makes zero sense.

In this listing the same seller is offering HEV's for this case, at a price that is essentially cost:

Helium Escape Valve for Omega Seamaster Diver 300M 210.90.42.20.01.001 Titanium | eBay

Sorry but none of this makes any sense if they are genuine parts. Looks like the parts listings he has are all not packaged parts, and along with those he's selling those "Marina Militaire" copies that were popular a number of years ago.
 
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O
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Archer Archer
From the eBay ad:

"This is an empty case without glass or back cover but comes with a matching helium escape valve.

This item comes from a parts dealer in Switzerland."

So this is not a case - it's the case frame, or the middle part of the case, but with the HEV fitted. This case frame is not sold separately, and the only way to get it is to buy a full case, and remove all the other parts from it.

So someone would have to spend $3,500 on a case (2 actually as the seller has 2), remove the case backs, bezels, crystals, then heat the case tube up and remove that (but leave the HEV in place for some reason, unless you want a $100 discount), all to sell the case frame for $300. This makes zero sense.

In this listing the same seller is offering HEV's for this case, at a price that is essentially cost:

Helium Escape Valve for Omega Seamaster Diver 300M 210.90.42.20.01.001 Titanium | eBay

Sorry but none of this makes any sense if they are genuine parts. Looks like the parts listings he has are all not packaged parts, and along with those he's selling those "Marina Militaire" copies that were popular a number of years ago.


Thanks for the context. Glad I cancelled it then 😀.

I did actually buy an 1109 movement and it’s already in the way that I need to figure out what to do with now. Open to recommendations. Also, hopefully this isn’t fake too?

https://www.ebay.com/itm/2564230800...5xvtkg4sck&var=&widget_ver=artemis&media=COPY
 
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Archer
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O obnauticus
Thanks for the context. Glad I cancelled it then 😀.

I did actually buy an 1109 movement and it’s already in the way that I need to figure out what to do with now. Open to recommendations. Also, hopefully this isn’t fake too?

https://www.ebay.com/itm/2564230800...5xvtkg4sck&var=&widget_ver=artemis&media=COPY

Not great photos, but nothing jumps out at me with regards to the movement. What you do have though is a tritium dial and hand set for an early Bond style Seamaster. This dial and hand set is for the mid-sized watch, so a 25518000. You could always find the case for that and you would have yourself a complete watch.

Case would be a 168.1502, 168.1602, or 168.1622.
 
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O
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Archer Archer
Not great photos, but nothing jumps out at me with regards to the movement. What you do have though is a tritium dial and hand set for an early Bond style Seamaster. This dial and hand set is for the mid-sized watch, so a 25518000. You could always find the case for that and you would have yourself a complete watch.

Case would be a 168.1502, 168.1602, or 168.1622.

tritium is a bit annoying because it’d all be expired at this point. Hopefully that is replaceable but not a huge deal if not .

leaning toward 166.1622 if I can find it. Alternatively do you know if a generic ETA case (spitfire?) would work with a different stem?
Edited:
 
0002s
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padders padders
And this is a legit titanium NTTD case? What I mean is that you are sure it isnt a Chinese copy of some kind, as that would open a world of pain I would have thought. If not, maybe a 1109 might be persuaded to work but it is a solid might.

DING DING DING

OP-
FWIW, NTTD used w/nato are running in the mid 6K range now
 
Archer
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O obnauticus
Alternatively do you know if a generic ETA case (spitfire?) would work with a different stem?

The 1109 is basically an ETA 2892A2, so any case made for a 2892 can work. It might not work with that dial, as cases are made not just for specific movements, but also for specific dials.
 
O
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Archer Archer
The 1109 is basically an ETA 2892A2, so any case made for a 2892 can work. It might not work with that dial, as cases are made not just for specific movements, but also for specific dials.


Makes sense.

I’ll just monitor eBay or w/e for a 166.1622 case then unless there’s a better place to buy them. cousinsuk doesn’t have any.
 
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