These might be useful for some type of experiments or repairing older cameras. They are trapezoidal in shape measuring 30x60x53mm (see picture, the color is just reflecting the wall, ceiling). 1.5mm thick. The surface is imperfect, as they have picked up some kind of spidery pattern from the tissue they have been stored in for 50+ years. 2 for $10 shipped in USA. Paypal accepted.
Jon
Jon
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