Antonio,
I have never heard of a CZ33. I have owned a CZ 38, which may be what they are referring to. It is a very odd pistol, which is hinged at the front and the entire upper assembly tips up to disassemble. This is the only CZ pistol I know of with a 1930's designation. Mine was in .380 ACP, (9mm Kurtz)
http://www.tague.at/pistolen/en_inde...es/en_cz38.htm