U. S. Department of Energy Gas Coupon Specimens

Uncut Sheet of four. Engraved Specimen or Essay tipped onto a sheet indentified as 
"Exhibit IV, U. S. Gas Ration Coupon Model. Designed and Produced Using Deep Bank Note Intaglio With Latent Image".  Likely a sample of a proposed coupon to potentially be utilized during the 1970's. Excellent.