I do not believe any 69R-H were sent to Vietnam. The 77E was the designation of guns sold to the US government. 69R was the designation of the police guns. 69R-H were the police guns finished to the exact same finish as the 77E, but once again, commercially marked guns. The only such guns out there all seem to be on a separate serial number range than the Government 77E contract,
In the listing of Savage-Stevens contracts for Vietnam era, no 69RH guns show up, only the 77E.
Also in the US Army take down PDF, there is no mention of the 69R-H, only the 77E.
Now a lot of folks would like to be otherwise, as if so then a cheap 200 dollar guns becomes a rare US combat shotgun (big $$).
Of course I could be wrong. What is your source for the info that the 69R-H was issued in Vietnam as part of the US aid package? Not some folks posting such on the net, but an actual official source that shows issue. If you are going by the Wikipedia posting, that was changed sometime after last summer, I suspect by someone trying to sell the 69R-H guns for big money once they were on the market cheap. Prior to the sale of the Arizona guns, the posting said only 77E were issued to the CIRG.