Originally Posted By: thermactor
I'm guessing that, rather than small washers, the impressions were made by carriage bolts. That would explain the square holes. The use of washers would make the square holes useless.

Wes


I never knew that; thanks for the info!


jake@aaroads.com

any questions about road signs - authenticity, value, etc - ask away!

the AARoads shield gallery - over 10,000 historic highway marker photos

San Diego, CA - US 80, 101, 395