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Belgium, panoramic helmet with filters for special hazards. Full-face helmet with panoramic visor, manufacturer unknown. Equipped with two threaded fittings for filter cartridges—in this case, DIRIN 300 SEKUR cartridges, possibly dating from 1983. Split rubber sealing collar. Foam interior and an internal switch, likely for ventilation. Functionality untested and not guaranteed. Signs of wear and patina. Belgium, full-face helmet with filters for special hazards. Full-coverage helmet with panoramic visor, manufacturer unknown. Fitted with two threaded connectors for filter cartridges—in this case, DIRIN 300 SEKUR cartridges, possibly dated 1983. Split rubber sealing collar. Foam interior and an internal switch, likely for ventilation. Operation untested and not guaranteed. Signs of use and patina.