For Patrick! This is about the Fairbairn & Sykes Dagger (aka Stiletto) of WW2 that was envisaged pre-war in Shanghai where the two inventors worked for the Metro Police. As WW2 started there was a need for a commando knife and W.E. Fairbairn and E.A. Sykes submitted their modified design which was accepted for service with Brit Commandos, Airborne forces, and SAS as well as some foreign SFs fighting the Germans. The double-edge blade was modified from 5.5" to 6.5" first pattern and then 7" second pattern. It has a sharp, pointy tip for thrusting and a simple guard, with a ring-pattern grip, and a rounded pommel at the end. Many were produced and used in WW2, esp. after D-Day. The knife was made to penetrate 3" of tough clothing before entering the human body. The OSS copied the knife as the OSS Stiletto with slight alterations before moving on to the official M3 Knife. The knife proved very popular and so production continued postwar and is still produced (mostly for collectors)! I had one I got at an auction but liquidated most of my edged weapons after a few decades. The F-S Knife remains probably the most recognized Brit battle knife in their history...???

* Hand-To-Hand combat
** Was tested against sentry overcoats & SS leather