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 Post subject: Patek Philippe - How to determine Cal Number
PostPosted: Fri Aug 05, 2016 6:45 pm 
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Location: NJ, USA
I want to search for a balance staff for this movement but when I search all references are for CAL number.
But I only see 901075, is that the cal number? Appreciate any help.


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 Post subject: Re: Patek ... Cal Number
PostPosted: Sat Aug 06, 2016 4:00 pm 
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Well, the 901075 does not sound like any Patek movement I've heard of, a serial# I would say.

Usually, the ranfft movement database is a good place to start for identification. However, they seem to have very few Pateks listed, the closest one I see is the 10-200 which is a more typical style of calibre# for Patek wrist watch movements (the movement diameter in lignes is the 1st component of that calibre# by the way). You can see it here:

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Patek-Philippe_10-200

Looking at yours, it would seem to be a rather early wrist-watch movement from Patek, likely 1940s rather than the 1950s shown in that link above. I see no evidence of shock-protection on the balance and also no fine-adjuster there either. It also has the American import codes on the balance cock, which may also help in identifying/dating it.

Some Patek movements do have the calibre# stamped on a plate under or nearby the balance wheel, did you try looking there? An example (23-300 ) is shown here:

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Patek-Philippe_23-300PM


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 Post subject: Re: Patek Philippe - How to determine Cal Number
PostPosted: Mon Aug 08, 2016 12:49 pm 
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Joined: Wed Aug 29, 2012 10:26 am
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Location: NJ, USA
thanks, I've not had a chance to follow up with the seller of this watch yet. But, will try to get a closer look on my next visit.

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