James -
I have a few lower grade I just picked up from your lists:
197, 246, 620
And a few that are mid grade:
131, 246, 270, 441, 461, 583, 604
and a pretty decent 630 Bonds RC
Interested in the 1960 low grade Mantle for a low grade 1960 set I'm building.
PLMK your thoughts.
Thanks!