Hello Gents,
Wilkinson is no longer in possession of their number ledgers. Richard Milner had the remaining Wilkinson ledgers. He runs a service called 'Arms Research' and if the associated ledger has survived can look up the numbers for a small fee. I will add a link to his website below.
http://www.armsresearch.co.uk/
I have a copy of the numbers and can date swords, knives and guns but no other information.
Wilkinson was very hit and miss with recording numbers and/or details or all their arms, so a little luck is needed.
Good luck and let me know if I can assist further.
Cheerio,
Roy