The Hermle 341 and 340 series is a spring driven westminster chime unit that takes a size #8 key.
This is a square shaped movement with the movement plate size of 100 x 100mm.
What is being offered on this page is the movement only with out the pendulum, gong or dial.
These movement come as the movement itself with its hand nut and if a pendulum unit, comes with the suspension spring and leader.
There are two balance movement styles produced by Hermle. The old style and then the new style.
Old Style The old style is one with a round spring that goes up and down (Vertical) in a circle around the center arbor of the balance wheel. In this style there is a slide arm with a tiny weight on the balance wheel itself. There is a + and - on the wheel. To speed up time go towards the plus sign. However this style is not always easy to regulate and can be very hard to get it perfect. The factory has special devices to make it perfect however it’s not that easy on the customer end with this style balance and this is why it has been improved upon. If you have the old style balance then your clock movement has some age to it and you may want to replace the unit anyway. We have the movement brand new with the new style balance for less than the cost of a cleaning on your old unit. Figure your clock movement has lasted you 25 years or so then in theory the new unit should last more than this with the improved aspects.
New StyleThe units offered on this page all have the new and improved balance assemblies. Despite the change on the balance, these units are a direct fit and will install in the clock case the exact same way as the old unit. If the numbers match from the old unit to the numbers offered on this page, than the movement will be the exact same as it is now but brand new and with the improved balance. The improved upon balance units have a different kind of hairspring (Horizontal) and a screw to regulate it rather than a slider arm. The regulator screw is on the back of the movement near the balance and has a + and - sign next to it. If the clock needs to be faster to keep time then the screw would be turned to the plus and opposite for slowing time.
The numbers on the back plate of the movement is everything one needs to get a replacement.
If the numbers match then the movement matches.
If the clock is a pendulum unit, be sure to select the proper CM length that matches the old unit.
$249 - $269
Prior to 1988, the year was two digits (79 was produced in 1979).
Starting in 1988 the year of was indicated by a letter.