May have found my answer c/o Mark Cooper. " By 1956, Slingerland-made Leedy drums were being offered as a second line and the drums were basically Slingerland drums with a few features that were unique to Leedy. The 1958 Leedy catalog does not specify which colors were available and states only that pearl and duco finishes are available. Most likely, only the basic colors were offered during the first few years, such as Black Pearl, White Marine and a few sparkle finishes. Many of the Leedy finishes offered were also available on Slingerland drums. However, by 1959, many new and exciting finishes were advertised." http://www.coopersvintagedrums.com/LEEDY%20FINISHES.htm

Interesting story...and I'd have to add that the black pearl specimen of yours is a stunner!

Here's one of mine that's not too common.