This bike's been on our local CL for a while now:

https://sacramento.craigslist.org/bi...321326856.html
The rear dropouts are a horizontal slot track style dropouts, but with derailleur mount; and there are screws and washers just ahead of teh rear axle for some unknown reasons. There are two FD mounts brazed on. I guess it's meant to accommodate some superhuman sized chain rings. The weirdest part is the two threaded eyelets welded to the underside of the chain stays. Does anyone have any idea what is going on with this bike?