Age of 1/2-inch square/round corrugated bar

[twhitehead]

Looking for expertise related to determining the age of 1/2-inch square and 1/2-inch round rebar, based on deformation pattern. The pattern is similar to illustrations of bar made by Corrugated Bar Company of Buffalo NY, but I'd like to confirm which mill made it and when. Seems that 1/2-inch bar was discontinued in June 1942 as a war conservation measure. If anyone knows of 1/2-inch bar made after 1942, please respond. I can provide a digital photo and sketch of the bar if you think you might be able to help.