In production from 1995 to 2003 the reference 5041 is undoubtedly the rarest and probably the least produced modern perpetual calendar. With a total production believed to be from 30 to 40 units only the ref. 5041 (available in white gold only) had various minor differences in comparison to its sister reference 5040. The bezel: while reference 5040 has a rounded bezel this reference has an enlarged fl at bezel. The dial: only available in black on reference 5041 its differences lie mainly in the outer minute markers (rather than a rail track it has simple dot markers) and the Breguet numerals rather than Arabic numerals.