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I have seen a YAMAHA DISKLAVIER UPRIGHT PIANO U SERIES and was thinking of trading up, or down depending on your viewpoint, from my standard U1. My U1 is a standard Ebony U1 with Serial Number 2,091,437 - searching this site says it was made around 1976. Firstly is that correct? Second - what would ...

I have seen a YAMAHA DISKLAVIER UPRIGHT PIANO U SERIES and was thinking of trading up, or down depending on your viewpoint, from my standard U1. My U1 is a standard Ebony U1 with Serial Number 2,091,437 - searching this site says it was made around 1976. Firstly is that correct? Second - what would ...