I have seen that cypher on other newer Wilkinson swords. It is "The Royal Warrant of Appointment" cypher of abdicating George VI.
It is seen on ERII sword blades, and unless the warrant has been revoked, it can still be used on blades today.
Now come on....you don't believe me?http://www.fieldserviceantiquearms.co.u ... 1001-p.asp
It is a "seal of approval" or endorsement.
What this sword is, military, foreign military, fraternal, Chinese knock off or private purchase sword, I dunno.