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| Index No. M8112 | Rare German Astronomical Movement |
| A very rare late 18th Century German cylinder with astronomical work. Unusual full plate centre seconds gilt keywind movement, large circular cock for the balance, part covering the mainspring in the resting barrel. Cylinder escapement, small brass escape wheel with few teeth. Complex under dial work with three arbors, the one at six o'clock for time. At ten o'clock the arbor has two hands, probably for date and moonphase. At two o'clock the arbor again has two hands, one rotating about once every 36 days and the other once a year (shown with this wheel removed). | ||
| Signed | Hahn Hofmechanicus in Stuttgart | |
| Circa | 1780 | |
| Very good, cylinder lacking but supplied with one in the rough for replacement. Lacking dial. | |||
| Diameter | 50 mm | ||
| Depth | 11 mm | ||
| A very rare German centre seconds cylinder. Probably Philipp Matthaus Hahn or his son, Christoph Matthaus. An interesting family known as court mechanics in the late 18th Century and subject of a biography by Max Engelmann in 1923. |
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