I'm not sure of the date of the "Rest, Rifle, Aiming". It is probably marked on it somewhere. I found out quite a few similar rests sold off a while back, but they were for the L1A1, and differed slightly.
Anyway, here's the pics of the 1940 Lithgow. The story , first....
A mate of a mate asked if I could strip and clean the .303 his dad left him, and teach him a bit about it. It had a lot of cosmolene in it, and cleaned up quite nice except for one small area of pitting on the side of the nosecap. It's all original; and matching, but had the foreend and possibly the front handguard replaced in service quite early as it didn't have the magazine cut-off removed and upgraded to III*. (?) The bore is immaculate, the boltface unmarked, and it has the green paint under the woodwork. The owner came back around and I assembled it in front of him, explaining all the markings (which I had typed up on three A4 pages for him to take). When I went to hand it to him, he said "you keep it- take good care of it"... end of story. The bayonet is serialled just 20 after the rifle, I had to have it.
PS; Gotta love an MA 41 marked magazine cut off!