There is a series of coins dated AH 1213 / 1789 AD:
KM# 260 (intended to be 1 Keping).
https://en.numista.com/catalogue/pieces43834.html
KM# 261 (intended to be 2 Keping).
https://en.numista.com/catalogue/pieces267239.html
KM# 259.2 (3 Keping). (Not in Numista.)
All three coins have the correct weight for the intended denomination, but all of them say "3 Keping".
These three types were minted in England and I suspect the dies were made based on KM# 259.1 dies by someone who didn't understand Arabic (and was poorly instructed).
KM# 260 was at one point described in Numista as a Mule, but it isn't a Mule. It isn't that the wrong dies were used, it is that an incorrect die was made for the coin. The same design was made in three different sizes.