Wrist shot of my Garage Sale, 1956 Omega Seasmaster Cal. 500

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In light of me buying a fake Omega I wanted to show a wrist shot of my garage sale Omega I bought for $175 a year ago. This watch is very weird. The strap size needed is 17.3mm? A 16mm is too small and shows a gap. The strap I put it in is a 17.45mm and still looks crammed in (most notably the bottom right lug). How do you guys think it looks? Should I continue looking for something closer to 17.3mm?

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Is it a US or Euro case? If the former, Tom will be along in one of his guises very shortly to enlighten you about 11/16" widths, if the latter then you need a 18mm strap.
 
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US market watches of this vintage were fitted with 11/16-inch straps.
 
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Very pretty watch. I have one that's for 17.5mm lugs (Omega case) and asked about US vs Metric lugs and there seemed to be some ambiguity about if there were English sized lugs at all.
 
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Very pretty watch. I have one that's for 17.5mm lugs (Omega case) and asked about US vs Metric lugs and there seemed to be some ambiguity about if there were English sized lugs at all.
English cased watches have metric sized lugs. Go figure.
 
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Crazy thing is that the strap I have on it is an 11/16 NOS JB champion and it's still crammed in. I believe it is a US case as well.
 
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English watches have metric sized lugs. Go figure.
Lol! I always feel odd writing English vs Metric for that reason.
To the OP- I have a lots of US watches of this period with 11/16 lugs and I just find my most pliable 18mm straps and those get relegated to 11/16 duty. Once they get squished down, they don't fit 18 well again so make sure you are commited.
 
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17mm straps are available from Hirsch. We had a thread about this somewhere.
 
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Did you suggest that one was tighter than the other? I had this situation on a stainless Bulova. I thought it was just a factory oddity. Turned out one of the lugs was slight bent inward at the bottom (hard hit), had my watchmaker straiten it out and all was well.
 
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Here is the 18mm lug Swiss cased version, solid 18K:

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Is it a US or Euro case? If the former, Tom will be along in one of his guises very shortly to enlighten you about 11/16" widths, if the latter then you need a 18mm strap.
Yup, US watch, 11/16" lugs. Most 17s are a bit oversize to compensate for the 17.25mm gap.

Searching for 11/16" straps on eBay will reveal a wealth of them. Unless your wrist is smaller than average, you'll likely want to buy the "long", which is closer to a modern length.
 
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I actually did try a 17mm strap and was still not satisfied with the small gap that showed. Maybe I will look for a thicker 17mm and see if that does it.

Why would an 11/16 strap still be crammed though?
 
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Very pretty watch. I have one that's for 17.5mm lugs (Omega case) and asked about US vs Metric lugs and there seemed to be some ambiguity about if there were English sized lugs at all.
Interesting you bring that up. I have a CK2390 that is identified as "international collection" and made perhaps in the late 40s... and has 11/16" lugs. So at one time... they had both. Be interesting to see what much earlier Omega-branded cases measure. My pre-WWI Omega doesn't count because it is 3/0 size in a Canadian case.
 
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I actually did try a 17mm strap and was still not satisfied with the small gap that showed. Maybe I will look for a thicker 17mm and see if that does it.
In my experience Hirsch 17mm is really 11/16th... but do look for vintage NOS on eBay.
 
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Interesting you bring that up. I have a CK2390 that is identified as "international collection" and made perhaps in the late 40s... and has 11/16" lugs. So at one time... they had both. Be interesting to see what much earlier Omega-branded cases measure. My pre-WWI Omega doesn't count because it is 3/0 size in a Canadian case.
6DE5B4FE-D922-4F96-9702-2A2836F84EAD.jpeg

C1953, 17.5mm lugs. Didn't bother me so much until I wanted to put a bracelet on it- finding the correct endlinks was a pain. Finally sourced them from a member here and the thought was that they were 11's that were cut down to fit the 11/16 lug width.
 
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C1953, 17.5mm lugs. Didn't bother me so much until I wanted to put a bracelet on it- finding the correct endlinks was a pain. Finally sourced them from a member here and the thought was that they were 11's that were cut down to fit the 11/16 lug width.
It's clear that the bracelet and end links I have on another watch I just got are... about that size. (Never thought about it until now.)
 
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It's clear that the bracelet and end links I have on another watch I just got are... about that size. (Never thought about it until now.)
Ah, they didn't fit the CK 2390 because just a bit too big. I plan on getting a new bracelet for the 166.010 anyways (3010/511).