Question on a Type 1 sight

[r3126]

Have been looking for a type 1 rear sight for my Rock-ola for quite some time. A friend referred me to a local man with a type 1 marked A-R on both the right base and the leaf. My Riesch indicates that this is a correct marking but indicates AR (without the dash). Is this an acceptable mark or is the sight a fake?

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[jimb16]

Can't tell without pictures. There are both real and fake rear sights marked that way.