Saw it on my local craigslist. Front wheel mounted motorized bicycle : old bike from fortys or fiftys These types of bikes look tough to drive on anything but flat land.
I'm no expert on antique or rare classic bicycles (although I'm old enough to be), but I certainly doubt that thing is older than the 70's. It pretty much looks like the old Chicken Power front drive engine kit, if I'm not mistaken.......please correct me if I'm wrong.
It does look 60s-70s ish rather than from the 40's. I've been lurking on craiglist nonstop, while hoping my stolen bike makes a return. I thought this one was curious. Good action overall.