2 Antique Chief Varnish & House Paint Advertising Glass Movie Theatre Magic Lantern Slides

This pair of antique movie theatre projector magic lantern slides advertising Chief varnish and paint would of been shown during movies in your local theatre of the day. They are probably from the 1920's/30's era and measure  4" x 3 1/2" in size. They do show wear and we did not try to clean them in anyway but none are cracked.