After many emails back and forth here the strategy (at the end of the game I told him that the last manual Autavia Siffert has gone for around 8k€ ):

"it is a joke ????
This watch has a real value of maximum 500,- Euro, it is not rare, not beauty, has no complications as triple calendar, moonphase, nothing, the technique is of the 1930th. Why he should get 8k for nothing ???

Why you dont buy real rare and good Heuers. Why these primitive Autavias ?"

I told him that I love primitive Autavias and offered 2k€ but no reply anymore...

Probably his intention was to convince me to buy one of his triple calendar Heuer for 60k€?

Anyway I'm sxared if we cannot trust anymore on Chrono24 too, probably they don't check if a seller is really reputable (but thry put the medal on them).

Best.

PS: on a thing I agree with him: why a person not insane should spend 8k€ for a manual Autavias with a Valjoux 7736? Only God knows...

G