$1 1935-A Silver Cert, Fr. 1610 Red S EXPERIMENTAL Problem-Free PMG VF 25

In 1944 the Bureau of Engraving and Printing decided to experiment with a new paper for silver certificates. Some 1935-A silver certificates were marked with a red R to designate the regular paper; others were marked with a red S to signify that they were printed on special paper. Thanks to their attempt, we now have terrific collectibles! 

This is an attractive example of a significant note that's remained impressively free of any problems or negative comments!