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
Inclusion of incuse letter
"C" on this Hartford U-292.