silver plate tea service

set of tea service by pairpoint mfg co, quadruple plate :

on bottom of tea pot:  6515-5  above hallmark  and 324   under the hallmark

                                                                                              C.

each piece has a different number.   I have the Coffee pot, tea pot sugar, creamer and another 

larger "sugar bowl" ( double handled with lid).   floral pattern motiff on body of pieces, grapes and grape leaves on "collar" of each piece.

Can you tell me the value of this piece? i dont know if its worth it to sell or just keep

Thank you,

Debbie

Fair