Hello everyone! I'm brand new to this forum, yes I am reading the information already posted, but I'm hoping that starting this discussion will help narrow things down. My dad came into possession of this gun in 1976 and was told it belonged to his father, who died in Vietnam, that it was his military service piece. But he has been getting conflicting information and no other history of this gun. He asked us to turn it in for a thorough cleaning and inspection. While I'm waiting I thought I would try to find out more about this gun. I made sure to include the pictures I took before turning it in, I'm sorry to say I didn't get any of the top of the barrel or with the cylinder open. Any information would be greatly appreciated by both me and my dad.