Carried one briefly when I was 2PPCLI Airborne in 1960 but it was not issue.
The Commando knife was purchased from a mail order surplus store for a couple of bucks. Genuine WW2.
It was lost on a jump into Wainwright so it's probably still there somewhere on the DZ.
The commando knife was subsequently replaced by a USMC K-Bar - best knife ever! Still have the K-Bar.