Light weight non detergent oil. Drop or two on the felt wiper once in a while, don’t over do it. 1 Drop on the moving pumping joints. Keep two pumps in it when you put it away. Probably last another 50 years
As you would say, “nice bit of kit”. Congrats I’m sure someone will be along shortly to give you the low down. We all grew up with a version of that. Here’s a pistol, and my old Benjy