Upon the destruction of the St. Mary's Church on Palm Sunday 1942, a large St. Mary's organ was not erected until 1968 after a building time of six years. It was built by the Kemper & Sohn, organ builder in Lübeck.
This huge work contains 101 sounding voices on five manuals (Kronenwerk, Oberwerk, Brustwerk, Hauptwerk and Rückpositiv).
An electrical stop - key board with six free combinations, free pedal combinations, two shutter swells and a roller swell are available to the organist.
The presence of a double manual stop - key board ( one register table each with all voices and secondary stops on the left and right side of the player) offers a possibility to the player to register several pieces before he starts playing.