I see you have the introductory packaging that the system was launched with in 1965, so yours should be a very early model from 1965 or perhaps '66.I was saving this unopened Techmatic for my SpaceX one-week flight around the moon with Elon Musk (still waiting for my invite).
But after reading all this, I may have to just crack it open and try it!!!
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The cartridge will not be of the adjustable type. That wasn't introduced until 1967. Still, the band should provide excellent shaves, even after all of these years, assuming it has been stored in favourable climatic conditions.
I bought just such an N.O.S. razor and cartridge and the shave was great, as new. Still have another one, unopened.