In a vault between the high choir and the south arm of the ambulatory is an Astronomical clock with chimes.

The clock, built between 1540 and 1542, is one of the most significant monumental clocks in the German-speaking world.
It belongs to the so-called "Family of Hanseatic Clocks", of which other examples survive in Danzig, Rostock, Stralsund and Stendal in near-original condition (two further clocks in Lübeck and Wismar were destroyed in 1942 and 1945 respectively).
The Münster clock shares a range of characteristics with this family of clocks.

The clock is also one of the few existing monumental clocks which turns anti-clockwise.

The chimes inside the clock (10 bells, tonal range of ¹–f²) can be operated from the cathedral organ.
In a vault between the high choir and the south arm of the ambulatory is an Astronomical clock with chimes.
The clock, built between 1540 and 1542, is one of the most significant monumental clocks in the German-speaking world. It belongs to the so-called "Family of Hanseatic Clocks", of which other examples survive in Danzig, Rostock, Stralsund and Stendal in near-original condition (two further clocks in Lübeck and Wismar were destroyed in 1942 and 1945 respectively). The Münster clock shares a range of characteristics with this family of clocks.
The clock is also one of the few existing monumental clocks which turns anti-clockwise.
The chimes inside the clock (10 bells, tonal range of ¹–f²) can be operated from the cathedral organ.
Münster Cathedral