Girard Perregaux

thanks Peter!

Hi Peter,

I've been doing a little more research on these movements and came across references to Communaut?e Horlog?re de Pr?cision (CHP). Apparently CHP took the AS ebauche and supplied finished movements to Girard Perregaux, Doxa, Favre Leuba, Eberhard and Zodiac.

GP replaced the standard AS click wheels with their patented Gyrotrones and made the other upgrades you mentioned as well. It's also possible Zodiac's version was proprietary in some way as it is often referred to (possibly incorrectly) as a proprietary calibre (in Bestfit for example).

Thanks for the beautiful blow-up of the GP 21! I had no idea it was not an automatic movement by design. Digging through these old movement numbers and development takes a bit of detective work doesn't it? Thanks for so generously sharing your insights and information.

_john

💰186 Marketplace Listings for Girard Perregaux›

vintage GP gyromatic - some help

By: ballchair2 : September 4th, 2002-01:01

Hello, my name is Mark (Germany) and I am collecting watches for quite a while. Well, yesterday I received my first GP (yes, it is an ebay one!) ? it is a man?s wristwatch, clockwork shows number 423788, 39 jewels gyromatic, case (between lugs) 9073 AF. S...

Some data

By: PeterCDE : September 4th, 2002-02:02

Hi Mark, first of all: Congrats, you?ve got a nice one. Calibre 42.3 was introduced in about 1966 as the third gyromatic movement by GP. Measurements are 11 1/2 lines (25.6mm) width, 5.2mm heigth and equipped with a patented micro-metric adjustment device...

is that the AS base?

By: ei8htohms : September 4th, 2002-03:03

Hi Peter, As usual, you are a fount of wonderful information on GP's! If that movement is based on the AS ebauche, I think the problem might be wear in the reverser gears. I worked on a Zodiac with that movement (the Zodiac 70-72) that had a badly worn re...

thanks, but no idea!

By: ballchair2 : September 4th, 2002-03:03

Hmm. Let?s speak BIG pictures for themselves....

By: PeterCDE : September 4th, 2002-05:05

Hi John, i was in hope you would join in as i?m lacking the technical knowledge to verify possible errors in a movement (even those i have in my hands). Regarding the base/ebauche some general words: In 1956 the first gyromatic movements were based on han...

to be here and share our passion for GP. Hampel?s book "Automatic wristwatches" mention CHP, but does not refer which AS base movement was used. According to germany?s Flume sheets (equivalent to Bestfit) several parts as the balance pivot are not interch...

thanks Peter!

vintage GP gyromatic - some help

Some data

is that the AS base?

thanks, but no idea!

Hmm. Let?s speak BIG pictures for themselves....

Peter, you did it again...

thanks Peter!

It?s always my pleasure

thank you so much Peter

There was an excellent discussion on this topic on WatchRap a few months ago...

Thank you very much, Peter!

Mark - Perhaps you can help ?