Rolex balance wheel question

timelyrestorations

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Jan 26, 2001
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From what I understand, a Rolex cal. 1225 is the same as a cal.1220, with the addition of a date module. If that is the case, would both calibres use the exact same balance wheel?

Thanks,
Doug
 

timelyrestorations

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Jan 26, 2001
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As no-one seems to have an answer, perhaps someone could suggest a source/resource (preferably online) where I could find this information.
 

Chris Radek

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Apr 13, 2014
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timeguy.com
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Checking another source (AWCI library) I also agree. The 1220 and 1225 both take balance complete 7625.

They both are based on calibre 1210, but 1210 itself has a completely different balance (screwed with overcoil).
 

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