This listing is for a WWII Vintage Square Red tin that once contained Caldwell Signal Bonds As produced by the Electric Railway Improvement Company, of Cleveland, Ohio. A quick search on google produced the information written below.
The tin is a 4" cube with aged patina. If there was an expiration label this is missing. Please see all images for further details of the items condition. Nice display piece.
"Historical Context: Dr. Charles Caldwell invented this exothermic welding process in 1938, and it was patented in 1939. These specific industrial tins commonly feature a stamped expiration warning on the side panels (e.g., "Use this metal before 12-43" or "before 7-1-43"), making them a direct artifact of WWII-era railroad infrastructure maintenance"
