It has to be less then 150 lbs, I could lift it by myself with no problem. I never actually though about weighing it, but it's too late now. Good question... anybody?
I put a Model A frame on my bathroom scale a few years ago. It was a stock frame with front & rear crossmembers only. I removed the center crossmember and all mounting brackets. If I remember correctly, it weighed something like 105lbs. For comparison I also weighed a friends 2x3x.120" rectangle tube frame. Same specs as a Model A but with 6" kickup in the rear and round tube front & rear crossmembers. It weighed in at around 175lbs.