A bit of history that might help...
In the late 1920's William F. Ludwig sold his drum company to Conn, a bigger music company which also owned the Leedy drum company. After a few years working for Conn William F. Ludwig quits to start a new drum company. He can't call it Ludwig because Conn owns that name so the WFL (his initials) drum company is born. WFL and Ludwig are competing drum companies. In the late 1940's Conn decides to combine its two drum making divisions into one and badge the drums as Leedy and Ludwig (one of your drums). In 1955 Conn decides to stop making drums altogether and puts both companies up for sale. William F. Ludwig Jr. buys the Ludwig division from Conn (Slingerland buys the Leedy Division) mostly to get the family name back. Over the course of the next few years the WFL brand transitions into the Ludwig brand. The Ludwig company today is really the offshoot of WFL rather than the original Ludwig and Ludwig, although that earlier company is owned by Ludwig so I guess you can (and they do) trace everything back to 1909 rather than 1938.
So your Leedy and Ludwig dates to sometime in the late 40's to early 50's. Your WFL would be from before approx. 1958.