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I have a old Cramer player piano and can't find out a whole lot about the thing. The serial number is 21145. I am looking to sell it but have no idea of the value. Help please. Leif

I have recently come across a piano that makes me curious. It is a Cramer player piano with a serial number #21145. Also on inside is the emblem stating "by special appointment to H.M. the king of Portgual". I am wondering if anybody knows anything about this item?