I jut picked up a CZ75 SC MASSADA myself. Information on them seems to be scarce. The Massada spelling apparently is spelled with both 1 and 2 "S's", and either is correct. I tried to contact CZUB to get info, but they really had nothing, no production numbers, dates, serial ranges, nothing. All they could tell me was it must have been a contract gun, but they were available on the Czech market as well.
Through other searches, I have stumbled on other info just not sure how much is correct. The info that seems to make the most sense is the CZ75 SC Massada was an Israeli contract gun in the early 90's. I have only seen them with 92 date codes, so early 90's may only be 92. Then around 04-05 CZ again offered the CZ75 SC Semi Compact, and the slides were markd as such, I have seen a couple pop up over the last couple of years. The Semi Compact apparently was a commercial offering only produced 1 year. This is what I have pieced together via various searches that seems to make sense. It may just be rumors, lies and inuendo for all I know. The only thing I know for sure is the SC in either stamping seems to be a mythical model, glad I got one.
There is apparently a really thorough book on CZ firearms that might possibly have info on the SC, only problem is it is only in Czech, and as far as I know only available in the Czech Republic.