Unusual Variety Find!

I just bought a rare Democratic Republic of Congo (Zaire) 1970 Pewter Essai KM E4 Pewter of KM13 from a major auction company. It weighs 14.36g, uniformed bust three-quarters right, rev. arms, value below, essai stamped below.

This seems to be an odd variety that has the word Zaires instead of Zaire on the reverse for the denomination. This is not like the coin pictured in KM nor is it like the gold and gilt coins that I own, which all are spelled in the expected singular version Zaire. I also have the Piefort KM PE2 version which also has the spelling as Zaire.

My best guess is that a worker at the mint made a spelling error that made it all the way to the production of this Essai and it somehow survived.

Take a look at the attached photo and let me know what you think.

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