hi Valjhun,
aqtai has shown a good overall selection of helmets, but i think you need to choose the culture that is most appealing to you. finding any helmet (either persian or indian) of the 18thC or before is extremely hard, and very expensive. 19thC helmets were made on mass as they were mainly decorative pieces for an export market (the military raj bringing home 'trophies'). it is possible of course to find earlier examples, but definately not easy. there is a distinct difference between persian and indian and each suits a different taste.
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