U-64: USA

2 1/4" X 3" (57mm X 76mm)

 

(Dome embossed) "B inside an O"

{Ohio Brass}

 

Picture courtesy Bob Berry

2 1/4" X 3" (57mm X 76mm)

 

No markings

 

 

Picture courtesy Elton Gish

U number assignment by Jack Tod.

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