Update - FWIW to others searching for "old gun" parts: I've had a very pleasant parts buying experience with Numrich Gun Parts. Can't believe they had ALL of the parts available to get this old 1940's vintage .22 back in operation! One short backorder wait for a couple "mag tube" items, and prompt hassle free replacement of a out of spec hammer spring - I'm very pleased.
Discovered that original stock finish on this rifle was some form of sprayed on[?] shellac? De-natured alcohol dissolved the remnants easily - Birchwood Casey "Tru-Oil" is a near perfect color/texture match and will be much more durable and easy to maintain.
I've enjoyed this resto project so much that I'm looking for a "vintage" .22 of my own!