18 1/2”’ | Hand Wind | Glashütte Lever | Small Seconds |

Remarks:

• DUF = 2nd quality from A. Lange & Söhne
• 3/4 plate
• Hidden pallets
• Maltese cross stopwork on mainspring barrel
• Numbering started at 20001 -> This movement is No. 312 (ca. 1880)
• Later movements with rounded 3/4 plate (two different shapes)

• Listing ID: 597
• Manufacturer / Brand: A. Lange & Söhne
• Caliber: DUF (Deutsche Uhrenfabrikation Glashütte) Savonnette 18 1/2'''
• Size in French Lignes: 18 1/2'''
• Size range mm largest diameter: > 40 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown with lever
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 15
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance with Breguet Hairspring
• Power Reserve: Unknown
• Production Period: From 1877
• Country: Germany
• Identification: 3/4 plate marked Deutsche Uhrenfabrikation Glashütte. Listed here: https://www.glashuetteuhren.de/kaliberuebersichten-modelle/a-lange-soehne/taschenuhr-marke-duf/
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-57#post-8044857
• External Link 2: https://www.glashuetteuhren.de/kaliberuebersichten-modelle/a-lange-soehne/taschenuhr-marke-duf/