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Exactly like the one you show. No text. What you have there is likely from the mid-late 1950s using the 420 manual wind movement, most likely in a UK made Dennison case. The Swiss made cases had 'Seamaster' and "Waterproof' on the back, the UK cases did not. I don't think the crown on the watch you show is original, it isn't the kind usually seen on a fat lug SM.
The Swiss equivalent is model 2761 but based on the caseback I am betting that is a UK cased version, like mine.
Exactly like the one you show. No text. What you have there is likely from the mid-late 1950s using the 420 manual wind movement, most likely in a UK made Dennison case. The Swiss made cases had 'Seamaster' and "Waterproof' on the back, the UK cases did not. I don't think the crown on the watch you show is original, it isn't the kind usually seen on a fat lug SM.
The Swiss equivalent is model 2761 but based on the caseback I am betting that is a UK cased version, like mine.
Up to you but if you want to talk numbers, give us an idea what the asking price is and I'll give you an opinion if it is fair. Being a manual wind, that model is IMO worth a little less than the auto 2577 bumper or 2846 full rotor fat lug models, maybe £100 to £150 less. The strap being original doesn't add a lot but an original buckle can add value if it still has that.
Interesting thread. No "SWISS MADE" on this Dennison example as well... Hidden under the rehaut?
http://www.superlativetime.com/product/vintage-omega-seamaster-cal-420-1956
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My 1950s cal 420 also has a plain case back. The example @padders posted is what you should aspire to. Mine is similar, but has sadly been redialled (though redials need love too):