you can get one on chrono24 for 9-10k euro. (about 12 of them are currently listed there)
so the fair price would be about 7-8k euro on this forum and shuck would ask x2 that as his is always "ultrarare" 😜
Advice ( not free of charge, will cost you a pizza and some Beer in Berlin after the shit is over 😀)
A.) Extract present? If not, make sure the movement belongs to the watch.
B.) Count in price for Service if the movement belongs to the watch
C.) See @default posting above
C.) Remember: buy the seller