I've never seen another one like it. It doesn't have a single part in common with a "modern" (i.e., post 1950-ish) Speed King as far as I can tell - it looks like a predecessor to the later classic design.
A friend just picked this up. It's hard to see in these quicky cell phone photos, but the painted parts are a very dark green, which are re-painted but he said is an exact match to the original paint that was mostly flaked off. The 'yoke' looks like it's cast from brass. The foot board is very well worn in the spot where the words "Speed King" originally were, so it's hard to make out in the photos, but in person you can see it still.
Any ideas?
Thanks.
Scott