Designed by Ernst Friedrich Büchel of Mehlis/Zella Mehlis, Thuringia, Germany. It features a semi-globe blade front sight on a ramp, late 19th century/early 20th century "BUG" proofs, an adjustable target rear sight, "E.F.B.LUNA" engraved on the left side of the frame, light border engraving, set triggers, checkered forearm and target grips, and matching serial numbers "404" and "04" on several components including the grip screws.