I have several of them that were on my trucks from the 3100 to the 6400. I beleive they are a factory upgrade horn, I also have the smaller ones that mount on the firewall.


"IT IS WHAT IT IS"
1953 Chevrolet 1/2-ton 3100 4x4
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1948 GMC 1-Ton (now sold to someone in Hawaii!)
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1953 Chevy 1-Ton