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I couldn't find my 721 pictures but here's a shot of a Tele-Tone chassis (different set, same chassis) and a 621TS chassis.
Notable differences are,
PM speaker vs EM speaker.
PM Trap vs EM trap.
Different tuner.
Missing resistor chimney on the back corner.
Shape and size of HV cage.
Minor placement differences of tubes and components.
Mini vs Octal tubes (does the 721 have minis in these locations?)
The 621 also is missing the Focus magnet because it uses an ES focus CRT.
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