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Keller Construction Sets

Keller was a very early construction system. It consisted of stone bricks (like Richter) and also metal parts in some sets to make bridges. It was thus one of the first metal constructional toys in the world. The system was produced in Germany from about 1886 to 1914. The metal bridge parts were introduced in about 1890 with revised parts being produced from around 1896.

The photos and information below is reproduced from a document that David Hobson produced in 1999.

Manufacturer / Distributor

Messrs. Keller Brothers, of Rudolstadt, Germany
UK Agents: Messrs. B. A. Grautoff and Co., 5 Jeffrey's Square, St. Mary Axe, London

Info from the Metal Constructional Systems Database for KELLER (sets including metal parts)

System Type
Non-Meccano type
1890 to circa 1914
Boss Type
no boss
Boss Thread
Diametrical Pitch of Gears
No. of Parts in System
32 (see comment *1)
Hole Pitch (Spacing) (mm)
Diameter of holes in Strips(mm)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
Types of Nuts and Bolts
Nuts: --
Bolts: --
Material/Finish of Nuts and Bolts
--  --
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Delicate parts push together (eg Strips, Braced Frames into tappered cheese Girders) for Bridges, Roofs, etc, with Bricks as needed. *1 2 phases, c20 in each with 7 common. The change was c1896. For details & names of sets see OSN 49,

Below there are manuals/leafets and photos which can be downloaded by clicking on the appropriate image.

Photos of the Keller constructional system
(Added 03/03/2021)

The UK patent for Keller constructional bridge parts
(Added 03/03/2021)

Below is some information on the Keller system written by David Hobson in 1999. It can also be downloaded to your computer if desired here

NOTE : If the MCS document does not appear in the window below, then refresh the page.

The report can be zoomed into, made full screen or downloaded as a pdf document by using the controls provided