Pulsation Bezel Question

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Not sure what model is correct for a pulsation bezel.

I read you refer to it as a “later” model, I’m a noob and happy to be corrected by other members but wanted to clarify that to me there is no “earlier” and “later” but rather there’s “original” and “replacement” and this one is a “replacement”
 
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It seems the 'original' was found on earlier versions late 60's and early 70's and this version, was found later. Is it true that its only a "service" part IE 'replacement' and not factory issued?

Or was this 'later' pulsation bezel ever factory issued?
 
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Thanks, it doesn't answer the question.

To answer your question: There is no answer. I have seen the Pulsations bezel on watches from the late 60s and early 70s. But I wouldn't doubt these bezels were available in the early 80s, while I personally believe that no watch left the factory with such a bezel. They were replaced by the jeweller who sold the watch or they were mounted later on.

Your bezel is a later service part. I cant't tell exactly when the redesign of the Pulsations bezel came out, but I think this was later than the early 1980s.
 
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To answer your question: There is no answer. I have seen the Pulsations bezel on watches from the late 60s and early 70s. But I wouldn't doubt these bezels were available in the early 80s, while I personally believe that no watch left the factory with such a bezel. They were replaced by the jeweller who sold the watch or they were mounted later on.

Your bezel is a later service part. I cant't tell exactly when the redesign of the Pulsations bezel came out, but I think this was later than the early 1980s.

Very grateful for your insights, thank you!
 
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The standard bezel being the Tachymètre, all the other variations were available as an option from the early sixties. You could order a Speedmaster with a Pulsations scale for example if you were a doctor and could better use that bezel rather than the tachy. Same goes for the Télémètre bezels (miles and km) as well as the Decimal which were intended for a military use. Imho the parts that you can order today, got redesigned somewhen in the late eighties / early nineties. Before, old stock of special bezels was used to cover the (low) demand.