Congrats on your latest acquisition, Fred.
You have your work cut out for you!
Here's my Rollfast, same rear carrier as yours and looks
almost exactly like the spring fork model shown in the 1958 ad you posted above. However, the seat and headlight on mine (as shown in photo below) I know for a fact are not original and mine had come with a tail light hanging below the rear of the carrier (not shown in photo, but I have it).
My bike was "barn found" with an older Troxel saddle on it (the type you see on many `50's Roadmasters) and US Royal Chain 2.125" balloon tires on it (and apparently Rollfast did originally use US Royal Chain tires on their `50's balloon models). This had me believing that this model may have originally been balloon tire and not mid weight. The frame / fork / fenders will readily accept balloon tires, they fit fine, but the skimpy look of the fenders tend to suggest its a mid weight. I see in the 1958 ad you posted, this model should be a mid weight (for `58 anyway).
I should check the numbers on the frame to see what year this one is. If indeed the older-style Troxel saddle that was on it when found was original (different than the more "modern" type seat shown in the `58 ad), and because mine had a tail light (not shown in the `58 ad), maybe mine is an earlier year (`57?). And thus at the moment, it is still a mystery to me as to whether or not this bike was originally balloon or mid weight.
I concur that this carrier must have originally been stamped with a bit of a curve in it (dipping downward in the center) since almost every one I've seen has the curve, including mine. Though the curve is subtle (can barely tell in the photo at that angle).
View attachment 2402776
See this thread, some related info:
My friend dave has a bike with the same tank, springer, and rack. It’s badged Rollfast. I did find a Snyder example in the archives...
This bike is badged as a Rollfast and has the same spring fork, chain guard and rear rack as the Mead Ranger that
@Sportyworty had posted, but not the same tank / frame. Fenders and rims appear to be very similar as well, both originally chrome. (Note: the headlight and seat on this Rollfast are not original and the bike originally had a tail light mounted under the rear carrier)
I found this Rollfast with US Royal Chain balloon tires on...