Method of payment for the canteen in Dora Mitelbau

Two coupons for buying food at the S.S. canteen in Dora Mitelbau Camp. On one side of the coupons the following is written: "Mitelbau Labor Camp" and on its other side: "This coupon is covered by the S.S. in the central area of Mitelbau. Charges will be pressed against whoever makes a change". The coupons are of 1 Reich Mark and 25 Reich Marks.
Dora Mitelbau Camp was a Nazi labor camp in the German mountains. The prisoners of the camp worked under the ground to produce V1 and V2 missiles, the missiles that had destroyed London.
Condition: Good. Few stains.