CD 185 SPECIAL MINE INSULATOR/JEFFREY MFG. CO. COLUMBUS OHIO/ PATENT SEPT 25 1891 with the SDP'S on top. SUPERB condition for a damage prone insulator! Three paperthin matchhead size skirt edge flakes, five partially nicked drips, two paperthin 1/4" base flakes, two tiny 1/8" base edge flakes and a rear 1/2" base flake are the only flaws! These are generally offered with severe damage. $ 285.00 includes shipping.