What's so special about the watch?
It's not everyday you get to see one of these watches - a triple calendar with an outer rotating bezel to make the dates of the month. The window at 12 shows the month of the year in abbreviated letters (and is changed by rotating the crown at 10), while the same crown pulled out will move the date of the week to correspond with the date of the month (e.g. October 1 is a Sunday).
 
What are the functions of the watch?
Time and triple calander. 
 
Let me tell you about the case...
The case of the Harvel Date-O-Graph is simple enough - a thin profile housing sharp horn lugs an a thin polished bezel allows the dial to stand out (as it should), and also gives enough legibility to the outer rotating day bezel. 
 
This sample shows that it's from the 50s - the case has obvious signs of use but no major damage that would hint at a large impact that caused internal shock. The acrylic crystal has been hand-polished with poly-gram and does not have any deep carve. 
 
And now the dial...
Patina-paradise! Age spots, freckles, dirt and chalk make up a considerable component of this dial.
 
The Harvel-Date-O-Graph is also known for its bulls-eye sector dial - a nice black ring housing the radium lume that has nicely patina'd in this example to a dark grey. The ring is interrupted by a large sub-seconds dial with fine markings that allow you to read the seconds without intruding on the other stark elements on display.
 
At 12 is a perculiar window in doughnut sector shape - a black disc with slender silver text displays the month of the year, manipulated manually with the pushed down crown at 10. It sits perfectly on the inner edge of the sector ring and balances the sub-dial well. 
 
At the outer edge of the domed inner dial sits the days of the week in the same stylised font as the months, but this time with contrasting big and small letters.
 
Existing all on its lonesome as the rotating bezel is the date dial, adjustable by pulling out the crown at 10. All prints on the dial are preserved nicely with no signs of neglect or unskilled handling. 
 
Let's not forget the hands...
Blue steeled syringe hands tell the time (the lume has partially fallen off the minutes hand), while a (used to be) bright scarlett pointer hand indicates the date and day.