I have I believe a Forbes tea cup. The markings are Forbes S.P.C.O 535 just wondering when its from and how much it might be worth? Thanks 
Hi there Nadine and thanks for joinign us. Forbes Silver Co. of Meriden, CT was formed in 1894 and one of the original companies that combined to form the International Silver Co. in 1898. It made silver plated holloware. American silverplated goods such as you describe have little commercail value, but are very nice to display or use.
Regards,
Uncle Vic