Calendar indicators have appeared on clocks since the late 17th century, but the first calendar clock patent was granted to John Hawes in 1853. Typically a separate face on these clocks showed the month, day of month, day of week, and often also lunar charts. Years later, the Ithaca Calendar Clock Company patented a mechanism to accurately account for leap years, resulting in what became known as the perpetual clock. Ithaca closed its doors in 1920.


Best of the Web (“Hall of Fame”)

National Watch and Clock Museum

National Watch and Clock Museum

This virtual museum, created by the National Association of Watch and Clock Collectors, lets you stroll through tim… [read review or visit site]

Clockhistory.com

Clockhistory.com

Bill Stoddard's clock history site offers a trove of great reference information on clock and watch makers includin… [read review or visit site]

National Maritime Museum

National Maritime Museum

Check out this sampling of nautical and maritime items held by the U.K.'s National Maritime Museum and Royal Observ… [read review or visit site]

Dan and Diana's Lux Clock Collection

Dan and Diana's Lux Clock Collection

Dan and Diana Lockett's amazing collection of several hundred novelty Lux clocks made by the Lux Clock Manufacturin… [read review or visit site]

Detex Watchman's Clock Album

Detex Watchman's Clock Album

Philip Haselton's guide to watchmen's time recording equipment. Includes 19th century German portables, 20th centur… [read review or visit site]



Clubs & Associations

Discussion Forums

Other Great Reference Sites