My reply, well we all were guessing over there where their ordinance supply came from.
The consensus, and I really hate that word, was that Ho Chi Min was buying supplies, new and used, from anyone who would sell or give to them in their support for the Communist agenda.
The majority of these folding knives were dis-colored, and had an "old patina" to them.
I personally thought these older ones came from the Indo-China wars such as Dien Bien Phu, where the French Army were surrounded and and surrendered.
Thanks, kxxr, for the surge of "memories that get misplaced in the library",, of your memories. 9 Bravo