One of my areas of collecting interest is in the Vietnam War, specifically US and ARVN items. However, I've been thinking about expanding into items from wartime North Vietnam, specifically rank items like shoulder boards and collar tabs. The problem is I don't know what (if any) differences can be seen between post-1975 rank items and pre-1975 rank items. The internet is surprisingly scarce about this area, and I was wondering if anyone has images of known PAVN wartime insignia or knows what to look for.
Thanks in advance.