This is a Tissot gold watch that is marked with 18k inside the lid but the chain has only two small stamps that looks like a T. Why don´t they also mark the chain with the gold content?
And is the value of a watch like this more than the price for the weight of the gold it´s made of?

 

Hi mate.

The bracelet was not produced by Tissot, it is likely from the country where the watch was purchased and added at the jeweller's/watchmaker at the point of purchase. As it isn't Swiss, the rules for gold hallmarks are different.

Value of the bracelet is likely to be scrap gold value and the watch isn't a lot more evem though it is a very cool piece.