Reminds me of the US Navy's AP bombs, such as the 1,600 lb MK 1 (various suspension configurations) and the AN-MK 1 version.
Image of the AN-MARK 1 MOD ? (can't see the MOD number).
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The MK 1 series certainly had a version with suspension bands like this those seen.
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There's also the 'smaller' 1,000 lb AN-MK 33. I presumed there's a MK 33 version, but I've not found it, but can check tomorrow.
Image of the AN-MARK 33 MOD ? (again I can't see the MOD number).
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A scaled version of you image below. For note there's no geometric correction in the scaling, as such the bomb should be slightly larger as it's behind the ruler.
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The AN-MK 33 bomb's dimensions; a diameter of 12" (305 mm), and a bomb body length of 59.75" (1,518 mm). The MK 1/AN-MK bomb's dimensions; a diameter of 14" (355 mm) in diameter, and a bomb body length 68.9" (1,750 mm).