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Iron Heart 666S

Tokyo / Japan / Online

The 21oz Devil — slim straight cut, 21oz Kaihara denim, super-heavyweight, and the Iron Heart model that defined the heavyweight category. Takes 3-6 months to break in, lasts 5+ years.

Best for — 666S, 21oz Kaihara, slim straight, 5+ years.

Made in Japan (Tokyo).

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✓ Personally verified — crawled twice, human-checked · July 2026 · no store paid to be here

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