Red PA markings of Remington 12g shotshells

Any meaning to red PA? I put the one without red PA under for comparison.

The Nitro Express looks to have a copper washed steel head & the red sealant is waterproofing as required for the military contracts of the time, The OO Buck is another give-a-way that it’s for the military or prison guard use.

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Hi Vlad, here is a picture of the box:



Regards,

Fede

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Thank you both, Fede, you must have read my mind 10,000 miles away, mine came without a box and I was just about to ask for it.