This is NOT exactly an Owen F 383 or 384, which he gives as a 'Brown' or 'White' Mountain Type. As Michael pointed out to me this one is the very first 'GOLD' Mountain type that came out in early 1974.

From that statement this Flash could only have been in use for a very short period......maybe a year or so in 1974, which makes it a bit on the rare side.
"Quartermaster's Comment":- I have to admit to not having seen one of these before.