This is a plastic window that can be used for an LCD. Outer size is 120 x 52 x 3.6 mm, window size is 118 x 40 mm. The picture was taken on green paper, the window itself is clear (colorless).
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.