Heuer Valjoux 88

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Hello,
I am about to sell this beautiful watch. And I'm not entirely sure about the value of the watch. My watchmaker said 12-15k. What do you all mean? Details can be seen in the link.

https://www.chrono24.at/heuer/triple-date-moonphase-valjoux-88--id18927468.htm

Furthermore, I am not sure whether the guarantee certificate is original. According to various information, the Valjoux 88 was only produced since 1948. The certificate was already filled out in 12/1945. In addition, the layout of the guarantee certificate looks more like it was from the 60s / 70s. Should you have any information on this, I would be very happy to receive answers!