A glass carrier plate that includes a front side, a back side and a circumferential edge zone. A mirror plate with a mirror plate front side, a mirror plate back side and a circumferential edge, wherein the mirror plate back side is attached by means of an adhesive layer on the front side of the glass carrier plate. Holding bars extend from the circumferential edge zone of the front side of the glass carrier plate. The holding bars are distributed over the circumferential edge zone and the circumferential edge of the mirror plate engages the holding bars so that the mirror plate is spaced from and positioned over the front side of the glass carrier plate.