c.1920 German Half-Second Wall Regulator with Riefler Pendulum.

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c.1920 German Half-Second Wall Regulator with Riefler Pendulum.
Inv. #: g165
Maker:

Anonymous

Riefler # 401

Description:

An early 20th century weight-driven wall astroregulator in a glazed mahogany case with a jeweled movement and Riefler pendulum numbered ‘401’.

Case:

The simple glazed rectilinear mahogany case has flat and beveled glasses to the sides and front door and four screwed wall stabilizers with large knurled edges.

Dial:

The silvered engraved regulator dial has separate minute, hour and second’s chapters and finely finished blued steel-cut hands.

Movement:

The eight-day weight-driven movement has finely cut wheelwork, an inverted dead-beat escapement with adjustable jeweled pallets, is jeweled front and back, has screwed pillars, maintaining power, a screwed beat adjustment, the minute hand secured by a nut that also serves as a set arbor, the winding arbor in the center of the hour hand and the weight suspended down the side of the case using an auxiliary barrel.  The half-second pendulum is signed, ‘Riefler, Munchen, DRR100870, 401.’, has an Invar rod, the bob suspended from the center, a calibrated rate-adjustment screw with a matching lock nut below, a tray partway up the rod and swings against an independent silvered engraved scale. It’s suspended by a steel spring with screwed brass ends and is held in position by knurled screws. Both the movement and pendulum are suspended from a bracket mounted to the backboard with 4 large screws.

Notes:

The dial plate has the following written on the backside:  ‘IgM 1917/12’.

Ref:

This clock was sold at Christies, New York, Important Pocket Watches and Wristwatches’, June 2005, Lot 45.

For a similar clock see: ‘Prazisionspenduluhren’ by Erbrich, pg.169.

Size: Height: 23.25 in.
Depth: 5 in.
Width: 10.25 in.
Retail Price: On Request

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