If the sword in question has a serial number (which OP hasn't shared yet), it may be found in the archives
https://www.armsresearch.co.uk/Wilki...n%20Swords.htm
Perhaps someone has already purchased this photographic records
Incidentally, I have found the auction house ad, since it is a completed auction it should be OK to publish its address
https://www.olympiaauctions.com/sale.../view-lot/259/