Appears to be a B&M Model 10 that has lost the rainshield on its housing. It almost perfectly matches. Good find!
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Just a wolf, siren enthusiast and railfan.
Owner of the Civil Defense Sirens Wiki, the best site for accurate siren information. https://civil-defense-sirens.fandom.com ... irens_Wiki
Proud owner of an FS&S Model L and Sterling Type F!