Vintage box of 3-1/4 x 4 aluminum frames and micro cover glass for binding 3-1/4 x 4 glass lantern slides.  There are 50 frames and glass slides in the box. Type No. 300.  The glass is wrapped in paper that says "made in Switzerland."  Emde products, however, is the manufacturer name on the box, which is in Los Angeles, California.  I couldn't find anything just like this anywhere to compare to.  All I know is what it says on the box.  They could be NOS but the box is open so I'm not sure.  The frames are in very good condition.  The front left corner of the box is torn.  Otherwise, the box is in good condition.  The box is 10 x 5 x 4 inches.  No nicks or cracks in any of the sheets of glass.  However, the glass is slightly cloudy in some spots, not sure why.

Please see pictures, as they are part of the description, and contact me with questions.

Very carefully packaged and shipped via USPS Ground Advantage.