KM#13 is the error variety of the standard quarter anna issued under Sultan Faisal bin Turki, distinguished by a retrograde date — the numerals struck in mirror image, almost certainly the result of a die engraver cutting the date directly rather than working from an intermediate transfer, a straightforward but consequential slip. Muscat and Oman's coinage during this period was produced under inconsistent oversight, and quality control at the striking facility left room for exactly this kind of error to reach circulation uncorrected.
KM#13 is the error variety of the standard quarter anna issued under Sultan Faisal bin Turki, distinguished by a retrograde date — the numerals struck in mirror image, almost certainly the result of a die engraver cutting the date directly rather than working from an intermediate transfer, a straightforward but consequential slip. Muscat and Oman's coinage during this period was produced under inconsistent oversight, and quality control at the striking facility left room for exactly this kind of error to reach circulation uncorrected.