Ariel,
James Allen and Brian Guilmour: Persian Steel. The Tanavoli Collection, Oxford University Press 2000.
A number of folding knives are shown, but they are all 19th century, and I don’t remember if older folding knives are mentioned in the text. Attached is the oldest one shown, dated AH 1221 (AD 1806-7).
Sorry I could not be of more help.
Jens
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