I think i may have the headphones , nice item .
Here are a couple of shots of what I've got , my mike seems different from yours . The headphone measure 1 15/16th . If you think they'll fit message me .
Nice flight helmet.
They have a hole for the wire and two posts, there is a small crack in the bakelite on one . The harness has all the wire eyes for the headphones mic and the female connector with wire cut .
Wonder if those were used in Type B helmets. From what I see on line, this is what the earphones used in Type C helmets look like.
You might be right , but I'd imagine one would fit the other . Look to be about the same diameter .