the original blue urethane nail had the same core as all the other hammers of the day, like it has been stated, looked kind of like a toilet tank float. that was surrounded by a thick urethane shell, harder than the black hammer and polished. was the premier light/short oil ball of it's day IMHO.
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i went to school and became a hazmat technician, now i glow in the dark
9/11/01, FDNY 343, never forget