Hello Josh :
I have a 99 Jinsen 40th series that was reported as being a Nam bringback. Mum , mis-match Nagoya bolt, serial No. 3991, early features. The stock was original and staked, but the screws were corroded in place, the wood had huge gouges and apprared to have been stored wet for long time, just plain UGLY. It was interesting as it was numbered 1324 in narrow 3/8 inch high numbers on top of the barrel chamber, it was decent under the wood which was original and staked, early features and a full mum.