Even the then War Office got confused on the making of the Mk4
“Jack Wilkinson Latham (MD at Wilkinson’s from 1935-1952) had a tussle with the War office (Now MOD) over a contract Wilkinson’s had for Kukri in 1951 marked WSC and 1951, of which 1,400 were manufactured. This was placed with Wilkinson’s as the War office was alarmed of what was perceived as to frequent replacement of Kukris.
It was noted that the inspection tolerance on the Notch (Kaura) were very, very tight. When this was queried with the Chief Inspector of Small Arms, Wilkinson Latham was told that the notch is a SIGHT and subject to the same inspection tolerances as a Rifle sight, Wilkinson Latham explained at length about the notch as being a traditional symbol and gave the CISA a short discourse on the history of the Kukri. At last, the CISA relented and the same manufacturing tolerances as the rest of the blade were applied.”