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CH 1918 DI (Official Stamps - War Board of Trade - IKW - Economie industrielle de guerre) Helveita with sword with three-line overprint "Industrielle Kriegswirtschaft", overprint with thin font, 1 value, SBK DI 13, Michel 6II, single value unused * with fold, stamps and overprints are genuine and impeccable, signed Zumstein