WW2 RAF 43 Pat Escape Boot Knife

RAF 1943 pattern boot escape knife. Brass sheath measures 8 x 1.5 cm stamped with the AM logo both sides. I am unable to make out the makers stamp located on ricasso of the larger blade. The knife is in goof functioning condition (uncleaned). Several types of this knife are know to exist, more commonly a single bladed version.

Code: 51828