I like Claven2 had a "brand new" 1916 Enfield rifle "overhauled" or FTR in 1953 when the British were cleaning out the last of the No.1 left over parts. The only "old" part on this 1916 rifle was the receiver and everything else was brand new and the rifle was never issued before being sold off as surplus.
Can there be such a thing as a "new, unfired No1Mk3*"?
Only in a military museum or a rifle presented to a high ranking officer fresh off the production line. The American General in charge of Enfield production at the Savage plant received the first production rifle off the line.
I almost forgot, if your an American and a drunken member of the American Legion you can order brand new Enfield rifles that John Wayne carried on Iwo Jima from the back of their monthly magazine.
(forgive me Canada but this advertisement is real)