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I forgot to post this second message I received from Omega.ch earlier this month about the differences between the two calibres 1154 and 1164. This message contains info a little different from that I posted earlier, hope it is informative to all interested parties.
Mus.
Dear Sir,
>
Further to your above enquiry, we have following details available to explain the difference between the indicated movements of caliber 1154 v. 1164 : ( automatic chronographs )
in order to improve the quality of our movements, it has been decided to switch from the past partly goldplated movement parts or having a simple rhodium plating, to an improved version in quality and entirely rhodium-plated
* these changes have started to be effective in 1995 ;
Therefore, the former calibre 1154 was originally having 17 jewels and gilt-plated movement parts. This caliber is the "chronometer " version of the basic movement of calibre 1155 ( base :Valjoux 7750 ). However, some newer movements of calibre 1154 have been partly delivered with 25 jewels and simple rhodium-plating.
* in 1995, the calibre 1154 has been replaced gradually, by the new version of calibre 1164, which is an improved version, completely
rhodium-plated, and having of course, 25 jewels
* it goes without say, that all spare parts of cal. 1154 cannot be used on the movements of cal. 1164 ...
We hope sincerely that you have now a clearer view of the situation between cal. 1154 and the present cal. 1164.
John R. Diethelm
Public Relations
*
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