Age of Peters Ammo Box

[mick56]

I have a few of these Peters ammo boxes and am wondering how old they are. I found a website, but it wasn't clear to me how old these are. Inside the flap are some numbers N 27 M 45, is this a date? The headstamp says Peters 30 USG.

 

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[Ruchman]

Dating Cartridge Boxes By Peters Cartridge Company - International Ammunition Association
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