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.
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.