Gambles Store Coronado Washer Advertising Glass Movie Theatre Magic Lantern Slides

This antique movie theatre projector magic lantern slides advertising Gambles Stores Coronado Power Washer 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.