Cheltenham and Company Silver Coffee Set Info. Wanted

This set was my mother's or grandmother's, it's at least 80-100 years old, if not older.  The set consists of a coffeepot (or tall teapot), a sugar bowl, and a creamer.  The handle on the coffee/teapot is black, as is the little knob on the top of the pot.  Both my Mom and my grandmother are deceased, so I have no info. about these items.  I'd like to know how old this set might be and what it might be worth.  Unfortunately, at the moment, I cannot provide a photo (my digital camera is broken)

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