My guess would be Ottoman marks, perhaps from the Tufekhane in Istanbul, where a lot of European imported arms for the Ottoman Empire were repaired and refitted. After all, in the first half of the 19th century, while the flintlock mechanism was still not replaced by percussion locks, only the Ottomans and Egypt (nominally part of the Ottoman Empire) were maintaining standing armies trained and armed in Western fashion.
Regards,
Teodor
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