I have a vintage Girard Perregaux 8614K manual wind watch which I believe to be from the 1950s based on the model and the history that I know of with it. I obtained this from the original owner's widow. She did not have the original bracelet/band. The diameter is 36mm, lug width 19mm.
The watch does show the patina you'd expect from a vintage piece. It is fully functional; you can see the second hand sweep in this video. The crown winds smoothly, with no grittiness or catching.
Based on this eBay listing for the identical model, I'd like to get $575 plus shipping for the watch. I think it's a fair price and I'm open to reasonable offers. I would really like the watch to go to a good home.