The numbers on the back plate of the 351-020 Hermle Clock Movement is everything one needs to get a replacement. If the numbers match then the movement will match. So if is says 351-020 it will be the correct one.
The 141-040K Hermle Clock Movement runs 14 days on a single wind. This 141-040K Hermle Clock Movement has rear strike hammer(s) that will strike out the hours a the top of the hour, and strike once for the half hour.
The 131-080 Hermle Clock Movement runs 8 days on a single wind. It has two hammers towards the top with a included bell. The movement will strike out the top of the hour via the bell, and then once for the half hour.
The 351-030 Clock Movement is a Westminster Chime unit with five chime hammers on the back of the movement. This high quality German movement comes oiled and includes its leader, suspension spring and hand nut.