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Patent Pending Omega SM300 Vintage Caseback?

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what do you guys think of this caseback? it was on a straight lug seamaster 300 with a 18 serial
 
20180605_152630.jpg 20180605_152641.jpg
rkman11
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Curious to hear the experts weigh in. I have some knowledge of Rolex patents (mainly the screw down crown) so interested to learn more about Omega.
 
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