Dear Sir, I am certain that these are not common. If the reels are in good condition there are many Art Deco afficianados & collectors that would be interested in the images. My advice to you is to hold on to them if possible. The architecture of the treasure island world's fair of 1939-40 is Art Deco at it's greatest. I personally would love to see the images but do not own a view master, and am not sure how many view masters have survived to today. If yours is in good working order, hold onto it. If you must part with it, get the viewer and the images appaised by someone qualified.