There is a (little) bug for undated coins with non-Gregorian dates.
In the following example, the issuind period should be:
AH(1285-1300) , (1869-1883)
N#48265
N#43788
The problem is bad data, not a bug. When ND is clicked the instructions are “Issuing years (Gregorian calendar)” but AH years were entered into the ND range for those coins.
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