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Reaching out to see if anyone here can possibly shed some light on the 'RO' stamp on the base of this German 10.5cm?
Is it a manufacturer's initial or an inspection mark? Also, the '4 M'....?
I suppose there will always be a few questions surrounding the various stamps we come across on certain shells. However, this sheds a possible light on this particular shell so thank you.
Regards!
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