thanks for posting pics! congrats on your new find!
I think that you are correct in your assumption regarding racer vs. roadster. you do have some great parts! the brake arm/rear wheel is defiantly original. the seat clamp is cool as well! does it have a patent date? I think I see 1926 on it. the sprocket seem like its cast and not stamped which means higher quality. I do, however think that both of our bikes have, at one time in their long lives, lost hardware. the bolts/nuts on the sprocket are a hardware store fix, im sure of it. other differences between the racer(mine) and yours is the subtle bend on the rear fork at the axle. the bend on mine is described as a design to keep everything level and constant if adjustments need to be made on the track. Also the bottom bracket bearings on mine do not have dust covers (explained in the catalog as an advantage on the track for ease of oiling instead of grease that I assume would slow you down. all this said, my "track" model was not a true track bike of high level campaign quality, definitely better quality than an average road bike of the time, but still mass produced. Mine is a Frank Kramer Special. I have heard about the little badge on the front that says "special" as well as" Special Racer"also one that just says "racer" all of which I have never seen for sale anywhere. I would very much like to have one. Also, if the date on your clamp is indeed original to the bike then yours was made in Angola and not Buffalo. I do not have anything on my bike to definitely date it. I would very much like to attribute mine to the buffalo location, but I may never know. all the serial numbers I have found are in all sorts of locations and no order or sequence has been discerned yet. I would very much like to get more info! thanks!