snuff bottle bought in China WW2

I am very anxious to know more about this snuff bottle given to me by my father who bought it in China while he was a naval guerrilla around 1943.
He has since died but I promised him I would do what I can to find out more. It appears to be porcelain with hand painted eagle with American emblem, also painted in gold. It may be Revolutionary emblem or war of 1812. The inside is white. The top is a light green jade, attached to a cork and what appears to be an ivory spoon.
I am not well and want very much to know how I would go about getting it appraised and gain provenance. Any help would be much appreciated as I have tried to find experts before with no results. Please feel free to offer your thoughts and advice. Thanks, Mary Horton