Spiratone was a camera store in NYC back in the 60's and 70's. They were known as a discount store and sold a lot of lenses and darkroom gear labeled under their own name. Some of it was pretty good and some was crap. One of their big sellers was a long telephoto (I forget the length) for $49. It was tested by some of the magazines of the day and it performed fairly well if you had the light for it's f/8 widest aperture and didn't mind carrying a lens that resembled a baseball bat.
You can probably find your info here:
Spiratone - Camera-wiki.org - The free camera encyclopedia