The "1925" number is NOT a serial number or year of production, but rather what was referred to as an "assembly number". In a nutshell, the rifles were fitted with all their parts during initial assembly...final fitting and any bugs worked out...then, the major parts were given the assembly numbers. Then the rifle was disassembled...and the parts sent off for final finishing. The assembly numbers, as you can imagine, were used so that the correct parts could be put back together, to make the finished rifle.
Over the years of use and periodic refurbishing in military service, it was not uncommon for certain parts to be mixed up, hence mis-matching floor plates, etc. All matching numbers are important for collector purposes, but not for function, as long as the bolt assembly and the receiver match ( that is best, as they were fine-tuned together at the factory...but that doesn't mean that a mis-matched bolt/ receiver won't work...only that matching bits will be smoother together).