The shells are the garden variety three ply shells that they used on all of their drums. They were Mahogany - Poplar - Maple but some could have been Mahogany - Poplar - Mahogany early on. They had solid, steam bent Maple rerings.
The finish was what is commonly referred to as trunk paint. It was a splatter paint with a grey base, and white and black specks and was commonly used as the finish for the trunk in many American cars in the 50's and 60's.
Rust-Oleum Automotive 11 oz. Trunk Spray Paint (Case of 6) simulates a factory spatter finish on trunk interiors. Scuff-resistant formula covers abrasions and hides surface imperfections. Durable coating,
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Most American drum companies used paint of some sort during the 50's - 70's. Gretsch used their silver fence paint. Ludwig first used the White gloss house paint, a brief period of clear finished interiors and then the trunk paint before doing away with it entirely on the top line drums. They continued to use it on the Rockers and Standards into the 80's. Rogers used a flat grey paint and then went to the trunk paint. Slingerland used a light brown paint during a period in the 60's. Camco used white house paint for a while.
People weren't obsessed with what woods drums were made from back then and since most drums were double headed, no one would ever see the inside so it was easiest to just paint the interiors.