I will investigate. He left me a few other watches as well. One was a white gold Daytona which I had overhauled and then sold to watch shop on Burlington Arcade. Another was a rose gold calatrava that was a lot heavier than this one which I sold as well.
Neither of them were really my thing, much too flashy. My grandfather never wore a watch so I really had no qualms about selling the lot of them.
I don't know anything about patek philippe but I had my suspicions about this one. Its very light and the strap is definitely not leather.
Not sure why he would have had a replica among his effects but we'll never know now.
My reason for asking if he had other nice watches, was often if someone doesn't generally have high end items, then frequently the "Patek, VC, Cartier, etc." that relatives find is frequently not the real deal. Sure there are exceptions. Also if someone never wore a watch, its odd that he would put good money into an expensive watch, but something can always be a gift from a relative or close friend.
I wish you luck with the current "Patek" you have, but I believe its a fake. Ask the people on the Patek forum at www.timezone.com if they have seen one like that, or bring it to an authorized Patek dealer and they should be able to verify whether its a real Patek.