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Wow, and here is Machete No 4908 at an eye watering price.

ORIGINAL 1944 MK 1 WW2 AUSTRALIAN PARACHUTIST MACHETTE BAYONET w/ RMB SCABBARD | eBay

WOW, this may confirm it to be real. Here is a link to an Australian ebay auction for a machete bayonet with the serial number 1 number below yours with the same markings. 4904 Yours reads to me...