XV5BB 1973 Vietnam

Information I've been able to acquire indicates there was only 1 legal station, XV5AC. There were many DX oriented hams in country at the time, with equipment set up at various locations throughout Saigon. They had to coordinate their operating times with callsign XV5AC so that no two of them were on the air at the same time.....or at least that's the way it seems when looking at the logs.

That XV5BB call was made to Fred Laun's (K3ZO) Argentina call sign, LU5HFI.

Info and QSL courtesy of KX4R
KX4R has the XV5AC logs.
Other info courtesy of K3ZO