1930's Bell Systems Public Telephone Porcelain Enamel 7" Original Round Sign
Original sign - not a reproduction. Original signs are convex. If they're completely flat their reproduction.
Convex" generally refers to a surface or shape that curves or bulges outward, like the exterior of a sphere or circle.
Sign shows shows some wear which is expected for the age.
Nice looking sign. Please see pictures for additional description and condition.