PeterCDE
10167
Welcome!
Hi Tim,
welcome!
Now that´s a cool story!
To get the watch back after such a long time is indeed outstanding!
On the watch, the serial number noted might be the case number.
So it´s a bit difficult to check, based on that only.
What might be help are movement engravings and the reference code, which might be found between the lug (may need to remove strap).
On the sales price, steel chronographs used to somewhat between $200 and $400, depending on the case/movement/features.
GP made chronographs using a Valjoux 72 based movement (Vx 726 and derivates, with and without flyback) between late 1960´s and mid 1970´s. There might have been a variant for a little less, but over the thumb that´s been what they sold for. And it´s not been a cheap watch at all in those days.
As to current value, it´s probably depending on the specific model and condition.
Both are a bit hard to determine, while in general timepieces of that time are not comparable to what GP does today. This is reflected by the price and i´d not expect it to be more than something between 500 and 1,500 if in collectable condition.
For restauration, which is probably well worth, i´d get in touch with a GP dealer.
Such work is best done by GP Switzerland and your GP dealer might assist in the details.
Hope this helps a bit, for a start?
Greetings from Germany,
Peter
Gerard Perregaux Watch from 1966