The View-Master. The mostly known stereographic size and viewer. The viewmaster showed here is produced about 1950.

The inviting company Sawyer’c Inc. had world-wide patents for this kind of round plate, so later in France and East Europe other kind of stereo viewers were produced, where the size of the psingle pictures were the same, but one pair of pictures was ordered under the previous. So there was no plate, that was revolved, but a rectangular card was moved downwards.

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