Dating hermle clocks
Most have the name Hermle on them but on earlier examples you'll see the initials FHS (for Franz Hermle and Son) and others may bear the retailer's engraved names (URGOS, Howard Miller etc) instead.The three most common spring-driven movements with Westminster quarter-chiming are the 340 series, which has a floating balance suitable for medium-size mantel clocks (see Image 1), and the 341 series (Image 2), which has a pendulum hanger (Image 3) suitable for wall clocks.
Nothing wrong with that if they're unused; pre-2010 movements might even be better than current Chinese versions.
Advanced Clock Repair (Tick Tock Productions/John Tope, 2002)AWI Lathe Course Overview Basic Repivoting (Ron De Corte)Cuckoo Clock Repair (The Clock Works)General Clock Repair (The Clock Works)How to Examine & Adjust the Recoil Escapement (Dr.
David Goodman, 1997)Learn to Turn (Bob Tascione, 2003)Modern German Movements (Mark Butterworth, 2002)PRO Advanced Clock Repair (Tick Tock Productions/John Tope, 2003) U. Patent Numbers and Dates Issued German Patent and Design Numbers and Dates Styles of Vienna Regulators - Excellent, lucid explanation on the styles by Dave Blackman, Steve Nelson, and Phil Rasch The Evolution Of Tower Clock Movements Electric Clocks Antique Clocks Price Guide Chelsea Serial Numbers and Dates Herschede movement dating by serial number Dating Hermle Clock Movements Escapements - Volker Vyscocil's great web site, with spectacular animated escapements Illustrated Glossary of Watch Parts History of the Gruen Watch Company Omega Watch serial number dating Elgin Watch Collectors Site Elgin Private Label Watch Database E.
Being cost-conscious, Hermle's brass plates are thinner than those found in many older clocks and this leads to pivot holes wearing more quickly, so it's especially important to give these clocks an oil service every three years (£40).
If you don't, worn pivot holes can be re-bushed but in some movements the pivot holes are so close to the edge of the plates that re-bushing is not safe.