« Reply #1 on: March 30, 2011, 12:50:20 PM »
That is a model 22. And very nice looking too. While 'officially' known as a Vz 22 most people call it a Cz 22 and use the 'Vz' to identify rifles.
The 'pinwheel' mark is a Lion and the '23' is the year it was accepted into military service. Yes, the numbers/letters are for unit designation.
There some more info here.
http://unblinkingeye.com/Guns/VZ22/vz22.html
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CZ22, CZ24, CZ27, CZ36, CZ38, CZ45, CZ46, CZ50, CZ52, CZ70, CZ75, CZ82, CZ83, CZ85, Drulov M70, DUO, Grand .38 Sp, Mars, Z, M1922, Praga, Praha, Slavia, Little Tom, VZ24, VZ33, VZ52, VZ52/57, VZ527, VZ54, VZ58, VZ98/22, ZKM451, ZKM455S