I think quite a lot of drummers had their toms on snare stands, Ian Paice was one of them, so were Jerry Nolan, Paul Cook and Charlie Watts.Your BDP's really nice. They haven't "yellowed" either, which is great. I've even seen some BDP's go "green".
I wonder how the original owner set up his tom with no mounts. Nobody was using a separate snare stand for their toms back then, not unless their tom-mount broke.