Here is a nice CD 143 that does not seem to come up too often -- actual postage additonal:

CD 143 CANADIAN. PACIFIC. RY. CO - vertical ridges above wire groove and horizontal ridges below! condition is not bad as these go -- there are areas of chipping on the horizontal ridges and a small base chip -- all should be visible in the photo. $110

NOTE: I'm selling these insulators on behalf of the Jim Fielding estate -- PayPal (no fee friends and family) or checks are both now accepted - I'll provide instructions. I'll also be handling all the packing and mailing.