Opinion really... I recently seen a supposed Vietnam bring-back, at a local gun show. It Did Not have papers, but they were only asking $400. The stock condition looked appropriate, above average finish wear ( also appropriate), blade bayonet-Sino Soviet. There was pitting but no rust. Other than no import marks, what else should I look for. Is there an exclusive receiver mark or anything else? I currently own 2 Russian, 1 Yugo, and 4 chinese, so I'm no "noob", but i'm no expert either. I'm familiar with Yooper John (love the site), but just looking for more input and/or experience driven opinions.