Ludwig '201' Speed King Vintage Bass Drum Pedal - 1960's – Rubix Drums
Early Bass Drum Pedals: Speed King & Beyond - DRUM! Magazine
Ludwig Speed King Pedal - L203 | Drummers Only
Ludwig Drums - Throw-Back- Thursday. The introduction of the NEW WFL Speed King Bass Drum Pedal in 1950. Revolutionary features for it's day and only $19.50. | Facebook
Vintage 1980s Ludwig Chicago Speed King Bass Drum Pedal Twin Spring - FSTSHP | eBay