Came with my 10x10 Fotar enlarger. Slight texture on one side so I believe it's anti-newton glass. Measures 10x10 but the corners are clipped so far that an entire 8x10 neg can't be projected! They came from a lab that specialized in automotive work before photoshop came along. WTF?
I have a bunch of these in 4x5 size as well.
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