View-Master Model A Viewer
First Viewer - Standard 3rd Version
The View-Master Model A viewer was made from Kodak Tenite plastic, which was very lightweight and very sadly prone to quickly warping. Even after two modifications in design, they could not stop the warping.
Today, it is nearly impossible to find one that doesn't show some degree of warpage, while most have severe warpage.
The viewer opened up like a clam-shell and the reel was placed on a center peg. The viewer was then clamped back together to view. A lever advanced each frame which was returned to it's original position by a piece of stiff bent wire, acting as a spring. These springs often snapped off and are almost impossible to repair. Caution should be taken when advancing the reel.
In spite of the warpage and the inability to advance a reel in most Model A viewers, they remain extremely desirable as the FIRST VIEW-MASTER VIEWER, and will always look great on display.
This Model A Viewer is called the Standard Model A Viewer, even as it was the third and last attempt at making an unwarped viewer, it was in production far, far longer than the first two versions, thus, it is found in much more significant numbers than the first two versions, and it is thus called the Standard Model A.
Good Advance - This viewer is moderately warped, but a reel is able to be advanced.