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1950's Calibre 420 Omega Seamaster help

D
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Hi all.
I have joined this forum in the hope I might get some help in identifying I
I was given it by my father in law many years ago and I actually was never sure it it was legit or not.
However I have been to Hugh Rice jewellers today and they've had a quick look and confirmed it as real.
They say it is a genuine Omega Seamaster Calibre 420 1950s 60s. But that's it other than it needs an oil and service.
Any further info would be very much appreciated.
 
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DON
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This is the movement

s-l400.jpg

DON
 
D
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Manyv thanks for that Don.
Being a complete novice what would be the easiest way to remove the back in order to check the details. Obviously without damaging/scratching the case.

Also do you have any other info about the watch that may help.
 
JimInOz
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D Davesmifff
Manyv thanks for that Don.
Being a complete novice what would be the easiest way to remove the back in order to check the details. Obviously without damaging/scratching the case.

Also do you have any other info about the watch that may help.

It has a snap back caseback, so removing it is a bit harder than with a screwback.
If you are technically competent, you can remove the bracelet to give you a clear area to work with.
Examine the edge of the case on all sides with a decent magnifier/loupe, there should be a small gap in the seam, usually opposite the crown.

Use a fine blade and work into the gap (groove) with a lateral seesaw motion. The idea is to use the blade as a wedge, NOT a lever!
You will see the gap get bigger, then you can upgrade to a thicker blade and repeat.

As I said, if you are not confident, go to a watchmaker (NOT a jeweller) and ave them do it.
 
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