chinese jade censer, it has two parts. There is a signature under the lid. There are several rings around it both on the top and bottom. On antique road show had one go through and it was worth a fair amount.
Siam was the name of Thailand before 24 June 1939 and again from 8 September 1945 to 20 July 1949. Bought during WWII by my great Uncle who was in the Navy. Past down to me.