Insulators as follows -- actual postage additional:

CD 160 ARMSTRONG'S No 14 // MADE IN U.S.A. "A in a circle" 2 49::.. -- Tougher version to find -- VNM -- $12

CD 160 MAYDWELL-14 // U.S.A. -- "tiny wide spaced drip points" -- light straw -- VNM -- $8

CD 160 MAYDWELL-14 // U.S.A. -- "wide spaced SDP" -- clear -- VNM -- $8

CD 160 McLAUGHLIN // No 14 -- SDP -- gray green -- VNM -- $15

CD 160 "star" -- blue aqua -- light dome rub -- $8