|The largest independent, non-commercial, consumer-oriented resource on the Internet for owners, collectors and enthusiasts of fine wristwatches. Online since 1998.
Vintage Heuer Discussion Forum
The place for discussing 1930-1985 Heuer wristwatches, chronographs and dash-mounted timepieces. Online since May 2003.
i have had many dealings with Werner and bought rather too many Heuers from him.
i can not recomend him highly enough. every transaction has been perfect and the condition of the watch has always been better than he has suggested. on one occasion i bought a blue dial Silverstone from that he said was in excellent condition, when it arrived it had the original heuer sticker on the back and had clearly never been worn.
i think, if he says your Monaco belonged to Jo Siffert, then it did.
as kav says, why not ask Werner if he could come up with any paperwork, or even write you a letter stating it as fact.
incedently, what model is your Monaco?