Audio-Technica - AT30GTR & AT630 MC Step-Up Transformer Turntable cartridge with stylus

A very rare NOS (new old stock) set made of an Audio Technica AT30E cartridge, with its transformer AT630, making this moving coli cartridge compatible with a standard preamplifier phono input.
I took it out of the package, tested it for 10 mins, to ensure it was still playable. To me, everything looks ok, including the dampener (which is the weakest point of an old setup). But this is an amateur opinion, based on his old ears...
Good luck bidding.