Would U Trade XL Jumbo Flap for j12 watch?

Id be inclined to think its fake. Who'd want to trade a 4K watch for an XL jumbo (especially if its a vintage jumbo).

The only catch about acquiring a used watch is hoping that the prior owner was responsible when she used it. Ie, battery changes only at Chanel or else the water seal is broken, and also if you dont properly pop the side winder in after changing the time, you can get water in there which corrodes the movement and you're out of a watch, no warranty would cover that.