Girard Perregaux

calvong
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GP observatory chronometer 1966

Hi,

After reading all the articles about the observatory chronometer I'm really interested in the piece and am looking to buy one if I can find one for sale.

Need some advice from you guys who have been tracking the vintage GP market for far longer than I - how often do you see this piece surface? And how much should I be prepared to pay for the watch?

Thanks much.

Calvin