Yugo M48 Markings

[Flying10uk]

Here are some pictures of a Yugo refurbished K98 with all the typical markings etc. Although it is U.K. deactivated I believe that the dealer that I purchased it from, back in 2001?, obtained a batch direct from military storage in Yugoslavia. Obviously the dealer did the necessary work to it for it to comply with the U.K. deac laws/regs in force at the time but other than that nothing else much has happened to it since leaving storage in Yugoslavia. All that I have done to it was to clean it and remove the last few remnants of cosmoline and to fit a fore-sight hood plus cleaning rod. The bayonet, I purchased early this year and perhaps unusually doesn't have a serial number on the bayonet it's self but does so on the scabbard.

Does anyone know the significance of the "X" scribed into the pistol grip near the trigger guard, please? Are the large numbers on the side of the butt stock a Yugo or German marking?

Thanks for any additional information.