Vintage Omega Seamaster 300 Day Date Discussion

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Hello guys. My question is simple. Have you ever seen one of these?
 
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1660034 does show a case - 40.5 mm diameter, 18 mm lugs, and with a Cal. 752 so day and date.
 
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1660034 does show a case - 40.5 mm diameter, 18 mm lugs, and with a Cal. 752 so day and date.
Interesting!- are any case parts or a dial listed as available?
 
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Hello guys. My question is simple. Have you ever seen one of these?

I’ve been tracking this generation of SM300s for about five years now and have yet to come across a day-date model.

The watch in the photo is a bit odd. I believe the Cal. 752 went into production in the late 60s. However, the bezel pictured is an early one.
 
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Interesting!- are any case parts or a dial listed as available?
Crystal, crown, case back seal, and case clamps - only parts that as available.
 
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Crystal, crown, case back seal, and case clamps - only parts that as available.
Good to know. It seems like probably the same parts as for the date/no date model.

Is the crystal 5076 or 5152? (Sorry for the questions!) If 5076, it would suggest that this would have been an early experiment that had limited production.
 
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Good to know. It seems like probably the same parts as for the date/no date model.

Is the crystal 5076 or 5152? (Sorry for the questions!) If 5076, it would suggest that this would have been an early experiment that had limited production.
Crystal - 063PZ5129
Crown - 069ST42028
Case back seal - 088NS0533
Case clamp - 72205501911
 
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I thought this was a concept model that didn’t actually make it into production.