Honestly...if the question is strictly about a dollar value, I'd move on. Even assuming you could establish provenance, and I don't think that you can, it doesn't have the fork and I think that seriously impacts value. I just don't see this as being especially collectible or valuable with what you have and know.

Personally I would build it up and enjoy riding it if it fit. It's probably worth more as a riding frame than it is on the market.