It is a CZ24, military proofed with the Czech rampant lion, and made in 1937.

It is a .380 (9mm Kurz), the CZ27 is a .32 (7.65mm)

It has the slanting slide serrations, they are vertical on a CZ27.
Note: the very early CZ27's had slanting side serrations, but a
different number of grooves than the 24.

It has a rotating barrel, the CZ27 is straight blowback.

The sides of the slide round over onto the top, the sides of the CZ27 are flat.

The CZ22 barely resembles the CZ24 and 27, most notably in the CZ22 grip
being at almost right angle to the frame and slide, and straight on the back,
not curved as the 24 and 27

The slide legend is different from the CZ27 (look up pics and compare)

The "death's head" (Totenkopf) emblem is a notorious fake item
appended to innumerable holsters, in an attempt to bolster someone's

[–]polio1962 2 points 9 minutes ago* It is a CZ24, military proofed with the Czech rampant lion, and made in 1937. It is a .380 (9mm Kurz), the CZ27 is a .32 (7.65mm) It has the slanting slide serrations, they are vertical on a CZ27. Note: the very early CZ27's had slanting side serrations, but a different number of grooves than the 24. It has a rotating barrel, the CZ27 is straight blowback. The sides of the slide round over onto the top, the sides of the CZ27 are flat. The CZ22 barely resembles the CZ24 and 27, most notably in the CZ22 grip being at almost right angle to the frame and slide, and straight on the back, not curved as the 24 and 27 The slide legend is different from the CZ27 (look up pics and compare) The "death's head" (Totenkopf) emblem is a notorious fake item appended to innumerable holsters, in an attempt to bolster someone's Munchhausenian stories about the war (in 99% of cases)