1. Identity & Origin
Clockmaker: Dietrich Koch (signed “D. Koch”)
Associated Family: Heinrich Koch (brother; clockmaker but never signed
clocks)
Workshop Location: Stromberg bei Eitorf, North Rhine–Westphalia,
Germany
Circa: c. 1845–1860 (mid‑19th century)
Regional Style: Rhenish / Biedermeier
Historical Context:
Dietrich Koch was a rural master clockmaker serving the Sieg River valley.
During this transitional period in German horology, many craftsmen acted as master
finishers: acquiring high‑quality movements (likely Black Forest‑made) and
completing them with locally produced cases, dials, and brass work for regional
clients. Production was small‑scale and largely handcrafted.
2. Mechanical Specifications
Movement Type: 30‑hour, weight‑driven rope‑drive movement
Drive System: Rope and pulley system using hand‑braided cord with lead‑filled
brass canister weights (pre‑chain design typical of mid‑century clocks)
Escapement Regulation: “Cow‑tail” pendulum with brass‑faced lead bob
Plates: Solid metal plates, indicating quality construction and
durability
Function: Time‑only or time‑and‑strike, depending on configuration; some
examples include bell striking for hours
3. Dial and Case Features
- Roman numeral
chapter ring
- 60‑mark outer
minute scale
- Regulator‑style
dial emphasizing precision
- Ornate brass
maker’s plaque signed “D. Koch”
- Case style
consistent with mid‑19th‑century regional wall regulators
The signed plaque suggests pride in craftsmanship and strongly indicates
a custom or limited‑production piece rather than mass manufacture.
4. Attribution and Maker
Identification
Horological directories list only one confirmed clockmaking family in
Stromberg bei Eitorf:
Heinrich Koch
- Listed as
clockmaker
- Never signed
clocks
D. Koch (Dietrich Koch)
- Signed clocks
- Almost
certainly the maker of this Stromberg clock
Because Heinrich did not sign clocks, any surviving clocks marked “D.
Koch” from Stromberg bei Eitorf are attributed to Dietrich Koch.
5. Meaning of “Stromberg bei Eitorf”
Stromberg was a very small rural settlement and not independently
recognizable outside the region. The phrase “bei Eitorf” (“near Eitorf”)
was added for practical identification purposes. Eitorf was the nearest known
market town with postal services, trade routes, and church records.
This practice was extremely common among 19th‑century rural German
clockmakers and served as a form of geographic clarification rather than
indicating work done in Eitorf itself.
6. Geographic Clarification
The Stromberg referenced on the plaque is:
Stromberg (Windeck), Rhein‑Sieg‑Kreis, North Rhine‑Westphalia
- A hamlet within
today’s municipality of Windeck
- Near Leuscheid
and Eitorf
- Not related to
other towns or regions named “Stromberg” in Germany
Most Probable Workshop Location:
Within the village of Stromberg itself, likely in a residential farmstead or
mixed craft household along the old ridge road between Leuscheid and Eitorf.
7. Rarity and Significance
- Production was
low‑volume and handcrafted
- Few clocks were
made; fewer survive
- Signed examples
from Stromberg bei Eitorf are rare
- The label
strongly supports authenticity, regional origin, and historical value





