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New to me Speedmaster 4.5. Any info is appreciated

Auksas
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My first post here.

Just acquired this (my 4th vintage Omega) and very happy with its condition. Can I ask more knowledge members to check the pictures for any potential problems, replacement , non-original parts, etc.
It runs great, winds and sets time/dates smoothly. Small scratches all around, slightly rounded edges of the case, few service marks on the case back.
All marking appear to be correct but I can not find any serial numbers.
Any information about the year of production would be greatly appreciated.

1000025970.webp 1000025973.webp 1000025972.webp 1000025976.webp 1000025967.webp 1000025983.webp 1000025984.webp 1000025987.webp 1000025986.webp 1000025985.webp 1000025974.webp 1000025982.webp 1000025980.webp 1000025979.webp 1000025978.webp
 
YY77
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I'm no expert but a caseback with seamaster is quite strange imo.
 
Donn Chambers
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YY77 YY77
I'm no expert but a caseback with seamaster is quite strange imo.
That’s normal on these models. I’m pretty sure all the Mark III, IV, and 4.5 have the Seamaster case back - because the cases were shared with Seamaster models and so it was cheaper to not have different caseback symbols.

Only thing that strikes me is the bracelet — while correct, that apparently empty hole on the one link pictured is troubling. These use a screw system and shouldn’t have an empty space at the end like that. I suspect someone was Jerry-rigged it with a pin or another type of screw. I wouldn’t trust that bracelet for wearing the watch until I evaluated all the links and connectors thoroughly.
 
Auksas
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Thank you. Will check and report back about the bracelet later today.

Few more pics from the original seller

Screenshot_20250401_103936_eBay.webp Screenshot_20250401_103940_eBay.webp Screenshot_20250401_103944_eBay.webp Screenshot_20250401_103949_eBay.webp Screenshot_20250401_103953_eBay.webp Screenshot_20250401_104012_eBay.webp
 
nkhandekar
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I have a big soft spot for the Mk4.5. It ticks a lot of boxes, central minute timer with wings on it (perfect for timing lectures), day and date, a cool movement/case construction. You have me thinking about one again, rather than a pocket watch I promised myself...

This watch sure has a lot of "patina". The bevels on the case look pretty softened as well. I hope it was a good price.
 
Pascal S
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That watch is mostly correct, but it's had a bit of a rough life by the looks of it.

There are two issues I could spot at the glance though.

The first one is that the hand for the 24 hour register at 12 is not the correct one. It should be triangular in shape, therefore distinct from the ones on the other two registers, as shown on the picture below.
b4100ddc-1b9b-42b9-bc32-9db0b2b4f369.webp


The second issue has to do with the movement's rotor. The part holding it in place either has a bit missing or is not original, and I suspect that it is not as secure as it should be. See picture below for what a Calibre 1045 should look like.
1045-d4.webp
 
Auksas
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Pascal S Pascal S
That watch is mostly correct, but it's had a bit of a rough life by the looks of it.

There are two issues I could spot at the glance though.

The first one is that the hand for the 24 hour register at 12 is not the correct one. It should be triangular in shape, therefore distinct from the ones on the other two registers, as shown on the picture below.
b4100ddc-1b9b-42b9-bc32-9db0b2b4f369.webp


The second issue has to do with the movement's rotor. The part holding it in place either has a bit missing or is not original, and I suspect that it is not as secure as it should be. See picture below for what a Calibre 1045 should look like.
1045-d4.webp
Amazing info, my friend. You have a good eye.
I will try to source those things and eventually replace it.
I paid $1600 after shipping and fees.
It looks nice in person and I am very happy with it.
Thank you again for sharing your knowledge.
I am also looking for a nice pocket Omega to keep a company to the one I have already (I believe 1920s silver pocket one)
 
watchyouwant
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Mvmt. Looks correct. The spring loaded Rotor clamp is easily sourced, just look for Lemania caliber 5100. The 24 hour hand should be available from Omega. If you want it serviced, only ask and find a Watchmaker with experience of the Lemania 5100. These are very rugged and well constructed movements.
 
SOG53
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Case very worn, dial looks damaged with discolored lume and possible water damage. Hope that was factored into price.
 
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