At the first time I would like to mention, that CZ 26 never existed, although I know, that it is in some literature (Know your Czechoslovak pistol, I think). CZ army pistols were stamped not with the type, but with the year of production.
This pistol is Czech army pistol vz. 24 in 9mm Browning.
1. On the top of the slide = CESKA ZBROJOVKA AS V PRAZE 46052 (and then a walking lion symbol) - it means Czech armory j.s.c in Prague and Czech acceptance mark after the serial number.
2. On the right side of the frame = J (walking lion symbol) 27 CET (with a small v over the C) Then 46052
Another acceptance marking J with walking lion symbol (national Czech symbol) and ?ET - it is not CET with v, but ? is special Czech character which is pronounced in English as you pronounce Cz in Czech. ?ET means, that it was accepted by "?etnictvo" - Czechoslovak uniformed police forces since 1918 to 1945. So this gun was accepted by police in 1927.
3. On the left side of the slide = CZ 26 (with a small v and A over the C and a very small symbol between the C and the Z) Lokks as though the small A and the symbol between the C and the Z could be an uppward pointing arrow that didn't get stamped hard enough?
?Z - ?esk? zbrojovka (Czech armory) with the arrow between ? and Z and the year of production of this pistol - 1926.
4. The barrel is seperate from the frame and I believe is called a rotating barrel. When I pull the slide back to cock the gun the barrel rotates about 1/4 turn.
5. It is a .380 ACP.
9mm Browning was an army caliber before the WWII.
There are some other pieces of CZ 24.
http://forum.valka.cz/attachments/12697/Pvz.24.jpghttp://forum.valka.cz/attachments/16927/CZ24_1.jpg - this picture shows pistol with the CZ 25, so it does not mean, that it is CZ 25...