Perpetual calendar
1822-1869
Ornate brass Perpetual Calendar
1801-1830
Perpetual calendar showing the moon's age
A perpetual calendar in brass for determining the dates of Easter in the Julian and the Gregorian calendar
Portable sundial and perpetual calendar
1693
German Perpetual Calendar in gilt metal
1701-1800
Perpetual Calendar in silver
1790-1860
Imitation amber, perpetual desk calendar in catalin plastic.
1948
Byzantine sundial-calendar
400-600
Silver perpetual calendar, dated 1765
1765
Perpetual calendar showing the moon's age
Perpetual calendar, French
Perpetual calendar, in brass box, German
Perpetual calendar
1822-1869
Perpetual calendar for the 19th century
1800-1899
Pin box and perpetual desk calendar in bakelite plastic.
1935-1939
Prognosticator, brass, unsigned
1538
Combination pocket sundial and perpetual calendar by Johann Martin
1671-1720
Seasons of Steam Perptetual Calendar
German Perpetual Calendar
1700-1799