Credit: Bobwatches

Reference 1655 (1971-1984)

• 39mm

• caliber 1575

• large orange 24-hour hand painted tritium indices

• black dial only

• lines between even numbers on the bezel

Reference 16550 (1985-1989)

• 40mm

• caliber 3085

• white gold surrounds on hour markers

• black or white (faded to cream) dials

Reference 16570 (1989-2011)

• 40mm case

• cal 3185 with Nivarox hairspring

• skinny red 24-hour hand

• black or white dials

16570 Version 1 – (1989-1997) Features “SWISS – T<25” Dial, 3185 movement, drilled lugs case, pressure bracelet clasp

16570 Version 2 – (1998/1999 features “SWISS” Only Dial, 3185 movement, drilled lugs, locking bracelet clasp

16570 Version 3 – (1999-2005) features “SWISS MADE” Dial, 3185 movement, drilled lugs, or no-holes case

16570 Version 4 – (2005-2011) features “SWISS MADE Dial, 3186 movement, no holes case, rehaut, solid endlinks, locking bracelet clasp

Reference 216570 (2011-2021)

• 42mm case (sometimes called a Super Case, or Maxi Case)

• caliber 3187

• black or white dial

• large orange 24-hour hand

• Chomalight lume

Reference 226570 (2021-present)

• 42mm case (sometimes called a Super Case, or Maxi Case)

• Caliber 3285

• Black or white dial

• Large orange 24-hour hand

• Upgraded Chomalight lume

• Enamel dial