[Gdog]

Is the "X" stamp on a CZ 52 (crossed swords best I can tell)
followed by 2 digit # the year the gun was put into military
service? If so what year do you have?
Mine is 54 , the holster has a 68 ink stamp.

 

[Easy CZ]

The pair of crossed swords are the Czech Army acceptance proofs. The number indicates the year of manufacture for the pistol.
The Czech army has been using a set of crossed Roman swords as its symbol ever since their independence in 1919 from Austria. This crossed Roman swords symbol is still in use today.
Source: http://www.ai4fr.com/main/page_militaria__collectibles_other_cz_52.html

 

[zaitsev44]

Easy CZ got it. It's the year the pistol was made. I have a 1953. I love it. You have one from the last year of production! My holster just has the "OTK" stamp, where is the "68" on your holster?

 

[Easy CZ]

Here's another good CZ52 markings link...

http://harringtonproducts.com/markings.php

 

[robertk7]

I've got a 53

 

[scbuxton]

A 52 and a 54 here.