This WFL snare (1948-52), 6.5" by 14" with a 3-ply maple shell, has a white interior paint, but no time stamp. The hardware is all nickel-plated.
This snare is in very good shape for its age and has a crisp snappy sound to it! (Sold.)
I have investigated about the white inner painted shells of older Ludwig snares, here is one interesting example from 1946 with timestamp on its inner shell.
Enjoy,
Fred