Gustav Becker Grandfather clock

by George
(Ormond Beach, Fl, USA)

My uncle bought the grandfather clock in Germany in the 1960's. The back of the face of the clock has Gustav Becker, a symbol with a cross on top, then what could be a crown. Under the crown are the initials GB with what could be an anchor in the middle of the initials GB, and under that the name Freiborg in SCHLc. It says Medaille D'OR and then below that it reads DRP, No 171659.

It is powered by two weights. I would like to get more info on the clock as I wish to sell it.