O. P. Co. porcelain signals
 The Ohio Porcelain Company, located in East
Liverpool, Ohio,  began manufacturing in 1897 and
would become property of G.P. Co. sometime between
1911 & 1913.
This very scarce U-274 is
embossed on upper side of wire
groove ridge "O.P. CO". Owned by
Jim Colburn.
Reported styles: U-274

Reported colors: brown, white