Chassis number is on a small paper tag. It can be anywhere on the chassis
or large part. usually starts with U, V, or T followed by numbers.
They fell off all the time so see if its in the cabinet.
Maggy model numbers are rarely useful in Sams. The used to sell
the same sets with totally different chassii. Same goes for audio.
Seperate chassis ##'s than the TV.
You can build a tuner subber & get other uses from it.
Get a solid state tuner with antenna isolation OR add isolation.
Needs 9, 12, 18, or 24 volts to run it. Also need a variable bias for AGC 1-3 VDC. Short the AFT to ground. Put it in a box & get a long IF cable with an RCA at the end. You seem like a builder so no big deal making it.
My father had the 27" magy. No UHF so pre march 1964.
Lasted abt 4 yrs & jug went soft. Bought a Zenith color then.
Other than that they were a well built set.
73 Zeno
LFOD !