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CH 1918 DI (Official Stamps - War Board of Trade - IKW - Economie industrielle de guerre) postage stamps with three-line overprint "Industrielle Kriegswirtschaft", overprint with thick font, 8 values, SBK DI 9-15, Michel 1-8II, Complete set unused * with fold, stamps and overprints are genuine and impeccable, Certificate Hoffner with field determination of the pressure plate: 3 Rp. (F16), 5 Rp. (F16), 7 1/2 Rp. (F18), 10 Rp. (F25), 15 Rp. (F12), 20 Rp. (F22), 25 Rp. (F4), 30 Rp. (F8).