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