Seldom seen or for sale!! CD 273 No markings -- aqua -- small (1/2" flat) base flake (see pic) -- $1350 plus actual postage -- These do not become available often!

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.