Here are two nice colored insulators -- actual postage additional:

CD 160 H.G.CO. // PETTICOAT (dome) large dot -- SDP -- blue aqua -- nice character piece with inner skirt overpour making it a partial "floater" -- just a small chip on the back skirt -- $20 (SOLD)

CD 108 NO. 9 / WHITALL TATUM CO. // MADE IN U.S.A. / 2 -- light purple -- VNM -- $30