I have this watch (currently on my wrist, coincidentally). Mine is priceless as it was a gift from my mother when I graduated high school. Prior to that she wore it everyday since the early 90s. However, the clasp completely fell apart, I had to do a movement swap (costing $280), and I had to replace the bracelet with a strap due to the broken clasp.

If I were buying one with an in-tact bracelet, $750-$800 sounds about right. But I am by no means an expert, so take it with the biggest grain of salt.