Paul I'm not sure why nobody has replied to this. I have a 2635, it's one of my favourite references. The lugs are a bit different to the 2577, which is the more common 'bumper' Seamaster. This looks like a pretty decent example, with a black guilloche dial and with the Breguet-style applied numbers too. The script all looks correct for the date, which is 1954 from the movement serial number. It's a fairly late one (2635-10), so has the cal 354 rather than the 351 of the first batches. This movement looks to be in nice condition. The case has been worn, as you might expect, but still seems quite sharp and not heavily polished. The crown is correct too, which is a nice bonus. So it looks OK to me . . .
Thanks John, It looked OK to me, but the black dial made me a little cautious and I thought it would be no harm to ask. When this watch came up I did a search for the reference and the thread with your 2635 came up. It looks great. Paul
Yes, black dials are always a warning to be extra cautious but this one looks good to me. The right-hand leg of the 'A' in Omega lines up with the 'I' in automatic. The Seamaster script has the 'S' with small top loop and larger bottom loop, and the tail of the 'R' drops below the baseline of the word. The chapter ring is also a correct variant for the period. Not many re-diallers get all this correct. I think this example may be an American import. Note the Breguet numbers, it looks like just "Swiss" and not "Swiss Made" below the six, and "unadjusted" on the oscillating weight. I'm glad you liked my 2635 - I was very pleased with the way it ended up, and it is still a favourite of mine and running well