PINCO porcelain signals
Three U-288s. First 2 are incised on crown. Signal on left is marked "PINCO" the signal
on the right is error marked "PINOC". The third 288 is incised on dome "PINCO-V".
Six U-292s. The first three are date coded & ink stamped on skirt.
Encircled/boxed "PINCO" with dot or dash over or under letter id coding for
production year.
Dot over "C" is code for 1949.
Dot over "C" is code for 1949.
Dash under "I" is code for 1957.
Marked on dome. Dot over "O" is code for 1950.
Ink stamped on skirt "PINCO-(#)" over "62". Number next to
PINCO is production line code and "62" is production year.
Nine U-300s. Incuse markings range in location: A) dome B)
crown-to-dome edge C) crown. Marked either "PINCO" or
"PINCO-(letter)". Letter is production line designation code.
Two U-305s. First is incised
on crown "PINCO" over
"305" this is an unlisted
Second U-305 is incised on
crown "PINCO- O" or "Q"
 The Porcelain Insulator Company (PINCO) located in Lima,
NY. Began production in 1921. In 1960 the Joslyn
Manufacturing & Supply Company bought up PINCO.

  Reported styles: U-288, U-292, U-293, U-295A, U-298,
U-300, U-301, U-308A, U-317A, U-342

  Reported colors: brown, cobalt, caramel, white, blue-gray,        
light blue, yellow
U 342 incised on crown "PINCO-V"