Reverse die m is another of the O/O over-punch mint mark coins that can be determined by the placement of the secondary mark.  However, the pairing with a die 1 on the obverse can be deceiving.

The die 1 is quite distinctive because of some over-polishing of the die at some point in its life.  The over-polishing is most clearly seen in the left wreath where various details are just gone.

In the eagle's right wing there is a loss of feather detail on the outside row of feathers.  We have seen examples with much less detail than the example shown here.

(You can see the coins in our collection by clicking on the VAM link below.)

Reverse Die m has only one pairing and that is with Obverse Die 1.  This combination produces VAM 25 - O/O Right.  We have thirteen examples ranging from AU 50 to MS64+, so a wide range to examine.

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82448855       Mint State 64+

None of the examples in our inventory show any signs of die cracks or breaks.