Thanks for the reply - only photos i have currently, and it'll be a few weeks before i see the watch to be able to open it up.
As far as i know it was bought new from the high street back in mid - late sixties. I think the non Omega crystal is more domed than the original, so probably not helping the look of the 6 o'clock marker (distortion ?). I'll have a better look at it during the Christmas holidays.
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