M-263 Advertising Slide for 1920's Projector, to be shown in public movie theaters during intermission. This glass slide, by the BELLEVUE HERALD, shows "The Famous Aerial Ferry at Newport, Wales". Original and Made by the National Slide Corp., Detroit, Mich. The slide is black and clear with sharp focus...and beautiful! The slide measures 4 inches by 3.25 inches. The photos I took don't do it justice!