Concho Belt with unknown markings

Hello i have got this concho belt but i wonder is it authentic ? And if this markings are known by someone AZ 7 AZ
The belt is from Arizona one old man got it on his trip in 80ties … if someone can help me i will be very happy !


Traditional Navajo concho belt. I think of those marks as trader marks to indicate cost, but I have never seen them engraved so well and that code doesn’t make sense. Hopefully someone else has come across this style of mark.

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