The 1st series watches are very very rare, as far as i know they have a slightly different shade to the subdials and leaf shaped hour and minute hands. Additionally they had a snap on case back.
2nd series had a screwed on back, leaf shaped hands.
3rd series had a screw-on case back and elegant baton hands for hour and minutes (like yours
)
Oh yes , and my absolute Grail watch that is.
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