H300 Mid-19th century upcycled Architectural arched dome top window sash with early mirrored back. Weathered surface - retaining original gray paint. A fantastic secondary arched interior molded edge mullion mimics the overall arch. That, along with seven individual molded edge mullions placed in a fan style pattern, creates the visually appealing appearance of a beautiful 16 lite transom. Primarily mortised and pegged construction. Heavy and very sturdy.