My friend aproached me with a watch he wants to sell, a Girard Perregaux Gyromatic. He doesn't know many details about it and neither do I (i am more into other brands).
The watch is in working condition, but only just. Winding the crown is very hard and sticky (obviously the movement needs an overhaul) but it does run. Didn't try messing around with it too much at this state.
After searching online for ref. numbers or indeed anything that can help me identify it I have up as there seems to be less into online on GP than Omega for example.
What I would like to know about this piece is:
1. What ref. number it is
2. What calibre it is (my guess is a 480 of some sort but I really don't know)
3. Estimation of how much it will cost the service it (movement and crystal)
4. How much will it sell for, current state and overhauled.
5. Anything else you might have to say.
I hope the pictures are enough, but I can get better ones if needed.
Thank you for your help!