Cal. AGH-1764 is a perpetual calendar movement with unique complications created by Agenhor for Arnold & Son. It was used int the True North Perpetual watch.
Functions of Cal. AGH-1764 include:
- Civil Time
- Solar Time
- Perpetual calendar with leap year
- Moon Phase disc
- 24 hour second time zone
- Equation of Time between civil time and average solar time for both dragging equation and sector equation