I also have two 8 1/2lb practice bombs painted white. My markings are on the unscrewed tail base where the primer fits.
I have OO with a line between the O's so maybe PP back-to-front? 41.
The other is MHK joined with a c above the H bar and & below it /4. Also stamped on the head.
I have no idea on the IM and MF on yours. Does not seem MF factory that made small arms ammo. I await the experts too. Ron.
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