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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, 7 values, SBK DI 9-15 (without 12I), Michel 1-8II (without 5II), Remarks: 15 Rp was not sold at the counter, counter set unused * with fold, stamps and overprints are genuine and impeccable, Certificate Hoffner with field determination of the pressure plate: 3 Rp. (F19) signed Zumstein, 5 Rp. (F10), 7 1/2 Rp. (F23), 10 Rp. (F5), 20 Rp. (F2), 25 Rp. (F10), 30 Rp. (F2).