I got this piece from former AAC helicopter pilot Dick Kalinski who flew missions in Borneo in support of SAS troops, and was given to the pilot by an SAS trooper in theatre. It is a hand made tribal (I think Iban) machete with wooden hand carved sheath. I particularly like the woven grass detail, which is there for nothing other than decoration I also have a standard issue 1960's British machete from the same source in pretty rough shape.
Interesting is the 22 marking, which I have always assumed to be related to 22 SAS. Perhaps done by the individual trooper to whom it belonged, or maybe the SAS had a batch of these made by a local craftsman and had the markings added at the time?