This perpetual calendar is a patent of late Vince Farkas, issued in 1900 as the photocopy of the original patent shows. The patents number appears on the "neck" of the medal 17922. Although the patent shows the calendar with Hungarian text, the medal offered here has German text. The medal shows wear but it is rare in this form.
Obverse: Shows the length of day and night and the rise and sunset times of different months. On the outer rim the name of month appear, that you can set and read the data respectively.Reverse: The days of week and dates
Metal: some metal, I cannot identifyDiameter: 26mm (1")-32.5mm Weight: 8.3gramm I have seen similar perpetual calendar but they omit the patent number, so it would be interesting to find out, which is the copy of which. A very interesting project for calendar medals collectors. I will send also the copy of patent if you wish,
A similar design was auctioned here:
It is interesting how Vince Farkas could get a patent for an existing design.
perpetual calendar is a calendar valid for many years, usually designed to allow the calculation of the day of the week for a given date in the future.
For the Gregorian and Julian calendars, a perpetual calendar typically consists... read more