Hi...I have never purchased from that seller, but I think it can be reliable since it is in the list of reliable sellers.
Anyway, wait for other answers.
Hi Freddy...
Sorry for the delay in replying.
Mine is the 6154 model, which I purchased from a watch enthusiast who works in the Italian Navy. When I bought it, it had no patina, which instead has developed little by little with normal use. The movement is an authentic Unitas 6497 and the dial with matching hands was handcrafted by this sailor friend. The strap with bronze buckle was added by me.