NASA - John Young - Charles DukeApollo 16, 23 April 1972 Geological samples by John Young and Charles Duke. Two (2) proofs, one period silver and the other chromogenic on Kodak paper. NASA AS16-116-18653 numbering in the upper margin (1). NASA legends and numberings on the back, including one on the label. Images: 19.5 x 20.7 and 19 .6 x 22.6 cmSheets : 20.3 x 15.7 and 25.4 x 20.3 cmApollo 16 is the first mission to land on high lunar plateaus .