LEGO Black Window 4 x 4 x 3 Roof with Centre Bar and Transparent Light Blue Glass (6159 / 75257)

LEGO Black Window 4 x 4 x 3 Roof with Centre Bar and Transparent Light Blue Glass has been used in at least 1 LEGO sets over the past 28 years, since it was first used in 1996. You can also find this part in at least 6 other colors. It has the design IDs 6159, 75257 which can usually be found molded into the bottom of the part.