Got mine too!
Definitely vintage, classic stuff here!!
I also think that this music would have been HUGE in the 70's. But that of course isn't realistic. That said, many have tried to recapture that vibe in some way with mixed results often sounding like a band trying to sound like they are in the 70's. This band eclipses that. They ARE that sound. The genuine article. Not a decent replica, but the real deal.
I do believe that they could be massive in this day and age with the proper promotion, touring etc. Just playing their stuff on the radio would IMO blow it wide open. If I were in the bizz I'd be looking to push this band. I really think its as sure a thing as there is out there today.
You got some magic going on here. Seize the moment.