yeah they made the switch from the bold claim of being water proof to the lamer water resistant later in the 60s. that radium lume still holds its charge. tho not for very long lol.
yes just the depth rating on the dial is different - and probably the code on the dials edge.
ive only ever seen one jewelled version - i dont know if its 21j using timex in house calibur or 17j using a german or chinese calibur as all 3 have been used in some of their eralier models like the 400 series.
i forgot to take screenshots but do know the dial code will be different as the movement is indicated on there.
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