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Adjustable Wrench 15" Diamond Calk Horseshoe Co. - $20 (Roch NE)
condition:
good
make / manufacturer:
Diamond Calk
model name / number:
Diamalloy 15"
size / dimensions:
15"
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This is what AI says about this wrench:
Based on your exact combination of markings, your wrench can be dated precisely to the mid-to-late 1940s, specifically post-WWII (circa 1945–1949).
Why these markings reveal the date:
• The Reinforced Hanging Hole (Post-1940): The raised, forged safety ridge around the hole means it was definitely produced after 1939. Prior to 1940, Diamond left the hanging hole completely flat and unreinforced.
• "DIAMALLOY" (Post-1931): The inclusion of the trademarked "DIAMALLOY" name confirms it uses the company’s signature high-strength alloy steel formula introduced in the 1930s.
• The "Missing" U.S.A. Text: If your wrench lacks the traditional "MADE IN U.S.A." or "U.S.A." stamp altogether, it is a hallmark of the immediate post-World War II manufacturing boom. During and right after the war, Diamond Calk Horseshoe Co. faced massive production demands. Minor aesthetic stamping dies—especially "MADE IN U.S.A."—were frequently omitted, simplified, or skipped on specific production runs to speed up the forging process.
Your wrench is a classic piece of mid-century industrial history, manufactured right at the peak of the company's manufacturing footprint in Duluth.