Another Help Me Identify This Watch

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Hey all just joined hoping I could get some help identifying my watch, was my grandfather's but struggling to find an exact match on Google.
 
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It looks similar to my 2635, seller's scans below. I suspect it's also a bumper auto, easily determined by holding the watch vertically in your fingertips and turning it in a circular motion to feel the rotor bump against the springs. Early 1950's vintage, yours is in great shape. If you tell us where you're located you'll get a solid recommendation for a watchmaker.
 
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Located in Bristol UK, yeah my mum said its was 1950s but unsure on the year he got it whilst he was in the navy so seamaster obviously was the watch for him
 
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Looks more like a 2767, because of the lugs and the no-date movement. How is the back of the watch?

Opening it would answer your question, as you should find the model number in the caseback and the serial in the movement, to help date the watch.
 
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Looks more like a 2767, because of the lugs and the no-date movement. How is the back of the watch?

Opening it would answer your question, as you should find the model number in the caseback and the serial in the movement, to help date the watch.
Looks more like a 2767, because of the lugs and the no-date movement. How is the back of the watch?

Opening it would answer your question, as you should find the model number in the caseback and the serial in the movement, to help date the watch.
Plain but polished finish with large seamster in a frame embossed around the chamfered edge
 
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The way to confirm the reference is to have a watchmaker remove the caseback. The ref is stamped on the inside.
 
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Proportions make me think it may be a mid-size ref 2828.
 
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I second the suggestion that this is a 2767. Based on the style of the “S” in Seamaster and case shape. It would be a bumper automatic cal 354 and preceded the 2846 which is a full-rotor automatic cal 501.
 
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It’s almost definitely a smaller 2828 full rotor reference IMO.

@Arr-ho, when you gently shake the watch, do you feel a heavy weight inside the watch moving around, or do you feel just very subtle spinning (or nothing at all)? You’ll know the weight if it’s there.
 
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I second the suggestion that this is a 2767. Based on the style of the “S” in Seamaster and case shape. It would be a bumper automatic cal 354 and preceded the 2846 which is a full-rotor automatic cal 501.

My money is also on a 2828.

There are 2846s and 2828s with the coat hanger S too so that isn’t all that conclusive IMO.

Here’s one
 
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Look at where the lugs join the case, the edge is higher. this is my ref 2828. Cal 470, the first full rotor automatic from Omega