Hartford Faience porcelain signals
   The Hartford Faience Co. made insulators in Hartford, Ct. and put out their first insulator catalogue in 1925. Sale of insulators ceased in 1947. All on this page have glazed pinhole collars to the first thread. All of the inner petticoat-to-thread depths are deep. Only the white Hartford's are all glazed pinhole. Pinhole tops vary from flat to smaller than dime sized indentation.
   
    Reported styles: U-283, U-284, U-291, U-292, U-293,
U-293A, U-297, U-309, U-313

    Reported colors: blue, cobalt, yellow, white, brown
Similar to U-309
Similar to U-309
Similar to U-309
U-292
U-292
U-292
Inclusion of incuse letter "C" on this Hartford U-292.