My PRC-1177 with 1967 P65 rucksack and extras. Nothing is Repro and all dates (but the machete) are pre 1970 dated. I have made a quick video on it for a fellow
P64 Lightweight Rucksack - FIELD & PERSONAL GEAR SECTION - U.S. Militaria Forum
How To Attach Your Lightweight Rucksack In The High Mount Position | Ruck Mounting EP 1 - YouTube
VIETNAM MILITARY P65 LIGHTWEIGHT RUCKSACK PACK FRAME BACK PACK | #469244002