... To see your perpetual calendar clocks and watches in action, as the date hand changes over not 1,2 or 3 days but FOUR days over to 1st March! 
I have a beautiful antique Seth Thomas Office Calendar 6 Clock. It is a beautifully made, spring driven, twin dial, manual wind 8 day power reserve fully perpetual calendar clock. The calendar needs adjustment only once in 400 years!
The one I have was made in the early  1900's and very accurate!
http://antiqueseththomasclocks.com/Seth-Thomas-0776.php2 pictures 


A Vintage Advertisement for Seth Thomas Perpetual Calendar Clocks

Video shot in HD, slo-mo! 
http://youtu.be/uVx6-kwlcOQ