Steel 4 x 3 inches. Engraved plate with a single Michigan Department of Conservation $1 Trout stamp, dated 1956. Detailed vignette of a burrowing mayfly used for fly fishing. Plate no. 10107. . This unique plate is part of an exciting offering from the Continental Collection of American Bank Note Company Stamp Plates unlike virtually anything we have ever offered. The term unique is absolutely accurate here as these plates represent the actual dies used to create the finished products and in many cases trial designs along the way to a finished stamp mostly for late 19th and early 20th Century issues.