I was under the impression that after all sniper modifications were made at H&H including a "telescope" fitted and sighted in, the rifle then received the final stamp of Enfield inspector Harry Hardwick, (“D6E”) on the left flat of the receiver behind the bolt as the above rifle has. I guess apparently this was not the case and rifles received the final D6E proof w/o a scope having been installed.
Seems a bit unusual as the proper fitting of the bracket and the scope and sighting testing seems like a major part of the final acceptence/proofing for a sniper, Ray