Insulators as follows - actual postage additional

CD 133.1 PATENT / DEC. 19 1871 // 3 / B -- nice light green with a little milk - small base peck and a couple tiny tics on the back -- $20

CD 133.1 PATENT / DEC. 19 1871 // 3 / C -- green aqua with a cool encased stone! -- base flake & shallow annealing line in the front by the "C" in DEC. -- $12

Or take the pair for $25