All Yamaha upright/vertical pianos have the serial number stamped on the gold colored cast iron plate. The serial number is located inside the piano at the top right corner of the plate.
Yamaha b1
43″ Console Upright Piano
Yamaha M460
43″ Console Upright Piano
Yamaha M560H
44″ Hancock Console Upright Piano
Yamaha M560QA
44″ Queen Anne Console Upright Piano
Yamaha M560S
44″ Sheraton Console Upright Piano
Yamaha b2
44.5″ Studio Upright Piano
Yamaha P22
45″ Institutional Studio Upright Piano
Yamaha P660QA
45″ Queen Anne Studio Upright Piano
Yamaha P660S
45″ Sheraton Studio Upright Piano
Yamaha b3
48″ Studio Upright Piano
Yamaha U1
48″ Professional Upright Piano
Yamaha U3
52″ Professional Upright Piano
Yamaha YUS1
48″ Premium Upright Piano
Yamaha YUS3
52″ Premium Upright Piano
Yamaha YUS5
52″ Premium Upright Piano
Yamaha b1 SG2
43″ Yamaha Silent Piano™
Yamaha b2 SG2
44.5″ Yamaha Silent Piano™
Yamaha b2 SG2
44.5″ Yamaha Silent Piano™
Yamaha U1 SH
48″ Yamaha Silent Piano™
Yamaha YUS1 SH
48″ Yamaha Silent Piano™
Yamaha U3 SH
52″ Yamaha Silent Piano™
Yamaha YUS3 SH
52″ Yamaha Silent Piano™
Yamaha YUS5 SH
52″ Yamaha Silent Piano™
Yamaha DU1E3
48″ Disklavier™ Upright Piano