Iwatsu Omega EX-816/824/1648 - Version 3 EX-1232/2464 - Versions 1 and 2

From the Station 20 when idle:

  1. Go off-hook and press [FEAT] + [8] + [1]
  2. Enter the time [HH MM] using the 24 hour military clock
  3. Go on-hook