No one can do anything as far as dating the gun, your pictures dont show any markings, a good start is whether or not the gun says C.S.A or D-Technik on it, if it is a real czech gun one of those will be on it somewhere. However, regardless of when the gun was assembled, the parts in it are likely much older than the reciever (at a minimum) is. No VZ-58 is 100% new production parts although the new CSA guns are close to it. All VZ-58 and knockoffs are built from old surplus demilled kits and all the D-techniks are rebuilt from military rifles onto semi auto recievers with everything else being original