13”’ | Automatic | Swiss Lever | Direct Sweeping Seconds | Date |

Remarks:

• No date quick-setting
• Movement catalogs list this movement with a diameter of 11 1/2”’ instead of 13”’. Both versions seem to exist
• Movement family:
  • HPP 450, HPP 460: 13”’, automatic, no date
  • HPP 451, HPP 461: 13”’, automatic, date
  • HPP 452, HPP 454: 11 1/2”’, hand winding, no date
  • HPP 453, HPP 455: 11 1/2”’, hand winding, date
• These movements are available with 18,000 bph and 21,600 bph
• Differences between the two generation are not known

• Listing ID: 4724
• Manufacturer / Brand: HPP
• Caliber: 451
• Size in French Lignes: 12'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Automatic
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: Date
• Jewels: 25
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Incabloc
• Beats per hour: 18,000 / 21,600
• Balance Type: Glucydur?
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1965
• Country: Germany
• Identification: Movement marked with HPP 450. This is the base movement without date. Listed in the Engelkemper catalog from 1969.
• Contributor ©: Uhrforum.de members Schnupperfuss and 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-7#post-1852176