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.
The Hermle 350-060 is a Westminster Chime unit with five chime hammers on the back and takes a number 8 clock key. The quality German made movement comes oiled and includes its improved balance for ease of fine timing.