Actually, it's not at all rare. It's in Sams 3221 - it's apparently a Special Edition set for some RCA anniversary, IIRC. (Hence the SE on the tail of the model number) I remember seeing one of those in the Langley AFB AAFESs exchange in the early 90's - and thinking, like most others "Dang, RCA's made themselves a Predicta!"
Stull wonder what the U<squared>VU is all about, though...
Cheers,