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Hew72 · 27 July 2022, 08:41 AM

Good Evening, Thanks to amin for adding me to the forum I'm looking for information regarding this vintage Rolex with Ultra Prima Movement if anyone can contribute, is there any way to tell if its chronometer certified also any further information would be helpful? Thank you in advance

Tools · 27 July 2022, 10:21 AM

The Swiss Chronometer Certification (COSC) did not exist until about 1974.

There was plenty of accuracy testing going on back then, but there was no real definition until COSC, and anybody could claim the title.

jlovda · 27 July 2022, 04:12 PM

Did Rolex copy Breguet? Those hands look familiar.

27 July 2022, 10:21 AM	#2
Tools TRF Moderator & 2024 SUBMARINER Patron Join Date: May 2007 Real Name: Larry Location: Mojave Desert Watch: GMT's Posts: 43,382	The Swiss Chronometer Certification (COSC) did not exist until about 1974. There was plenty of accuracy testing going on back then, but there was no real definition until COSC, and anybody could claim the title. __________________ (Chill ... It's just a watch Forum.....) NAWCC Member

27 July 2022, 04:12 PM	#3
jlovda "TRF" Member Join Date: May 2009 Real Name: John Location: Midwest Watch: 5513,1675,216570 Posts: 1,492	Did Rolex copy Breguet? Those hands look familiar.

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