Junghans J28/2 / 628 / 628.02

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19”’ | Hand Wind | Swiss Lever | Stopwatch 1/10 s, 60 s, 60 min, Interval Timer |

Remarks:

  • Three-circle stopwatch: three decentralized displays, no central display
  • 1/10 second at 6 H, 60 seconds at 2 H, 60 minutes at 10 H
  • Column wheel controlled
  • High-speed oscillation
  • The Junghans J28 / 628 was available in four versions:
    • J28 , 628.00: Stopwatch, 7 Jewels, 1/10 s (36,000 bph)
    • J28/1, 628.01: Stopwatch, 15 Jewels, 1/10 s (36,000 bph)
    • J28/2, 628.02: Interval timer, 7 jewels, 1/10 s (36,000 bph)
    • J28/11, 628.11: Stopwatch, 15 jewels, 1/100 s (360,000 bph)
    • J28/20: Stopwatch, “Worktimer”, 15 jewels, 1/100 s (360,000 bph), only one single specimen known!
  • Minute counter runs continuously, as it is driven directly by the mainspring barrel, which makes one revolution per hour
  • Maltese cross stopwork on the mainspring barrel
  • Optional: Swan-neck regulator (see extra picture)
  • In 1962, Junghans renamed its movements, and the J28 became the 628

 

  • Listing ID: 7999
  • Manufacturer / Brand: Junghans
  • Caliber: J28/2 / 628 / 628.02
  • Size in French Lignes: 19'''
  • Size range mm largest diameter: > 40 mm
  • Shape: Round
  • Winding: Manual (Crown)
  • Hands Setting: Crown
  • Seconds Hand: Small seconds
  • Escapement: Lever (Swiss, English, Glashütte)
  • Date, Day, Month...: None
  • Other Functions: Stopwatch
  • Jewels: 7
  • Balance Position: Bottom (120 - 240°)
  • Shock Protection: Junghans I
  • Beats per hour: 36,000
  • Balance Type: Nickel
  • Power Reserve: Approx. 3 hours
  • Production Period: 1956 - 1982
  • Identification: Movement marked with Junghans star and 628/02. Listed in Flume K3 catalog, but without illustration. Listed in Junghans catalogs.
  • Country: Germany
  • Contributor ©: Uhrforum.de member Badener (Andreas Kelz)

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