11”’ | Hand Wind | Swiss Lever | Indirect Sweeping Seconds | Date |

Remarks:

• Part of the NH movement family (internal designation of Prim) with many variants:
  • NH: Small seconds, without date, without shock protection
    • K25, 010, 0101, 011, 0111 (designation until 1965)
    • 50, 50.1 (designation from 1965)
  • NH-D: Small seconds, date, without shock protection
    • 012, 0121 (designation until 1965)
    • 52, 52.1 (designation from 1965)
  • NH-CN: Indirect sweeping seconds, without date, with shock protection (ELAST-BLOK)
    • 013 (designation until 1965)
    • 56 (designation from 1965)
  • NH-C: Indirect sweeping seconds, without date, without shock protection
    • 014, 0141, 0142, 0143 (designation until 1965)
    • 55 (designation from 1965)
  • NH-CD: Indirect sweeping seconds, date, without shock protection
    • 015, 0151, 0152, 0153 (designation until 1965)
      Differences between the variants not clear, contradictory information available.
      Variant 0153 possibly without friction spring for second wheel
    • 57 (designation from 1965)
  • NH-N: Small second, without date, with shock protection (ELAST-BLOK)
    • 016 (designation until 1965)
    • 51 (designation from 1965)

• Listing ID: 2155
• Manufacturer / Brand: PRIM
• Caliber: 015
• Size in French Lignes: 11'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: Date
• Jewels: 16
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance with Breguet hairspring
• Power Reserve: Unknown
• Production Period: 1959 - 1968 (all variants of the NH movement family listed below)
• Identification: Movement marked with PRIM and TYP 01 (under balance)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-41#post-5369498
• Country: Czech Republic
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)