The Silvertone is a phonograph that was made by Sears to compete with
the more well-known phonographs like the Victors, Edisons, Columbias,
etc.  I would guess their date to be in the 1920's; therefore I would
say your phonograph is about eighty years old.  It plays 78 rpm records
rather than the earlier Edison Diamond Discs.

I assume yours is a floor model with an inside horn.  Unfortunately
they are not all that valuable.  But its value would also depend on the
cabinet condition and on whether it works.

Leslie Hoffman