Sorry, I missed your message, I am now travelling in Asia. I think most of the eateries were the 'boat people" refugees opening, arriving in the 70s or 80s in France. Not sure about dating from the first Indochine war.
A pretty good restaurant in place de Maubert in the 5th district that we went several times, Kim Lien.
There were others quite good, I will try to get back to you when I remember the name or where by looking through my notes in a few days time, they were a bit more pricely.
In 2 days time we will in Phoc Quoc and after in Saigon in Vietnam, sure food is much better than in Paris.