BALL-ILLINOIS at one star (2,500 or fewer) is nonetheless one of the most rare Illinois watches ever made, as it is the only 16S railroad watch that Illinois ever produced specifically for BALL[Shugart 2007, 155]. There were approximately 34,000 watches in 23 Jewel made with the sixty hour feature. This figure represents less than 6 tenths of one percent of total Illinois production.
How many survive today is another anybody's guess, they however are very sought after in nice condition, with proper dial and case. The 16-size open face gold-filled case No.
9,531,472 features floral decorations and signed Ball. Official RR Standard, Keystone, Watchcase, J Boss, 10K Gold Filled. 5 Positions, 23 Jewels, Patented, Double Roller, Official Standard, Motor Barrel, Trade Mark. Jewel Setting: Raised Gold Settings (Screw-Set). Adjusted # of Positions: 5.In layman's terms, a pendulum or balance that takes the same time to complete a swing no matter how big the swing is, has the property of isochronism. An isochronal oscillator, whether a balance and balance spring, a pendulum, or a quartz crystal in a quartz watch, is essential without one there is no timekeeping.
The item "Ball Illinois Pocket Watch, 16s, 23J, 810, Official Standard Railroad RARE" is in sale since Tuesday, May 10, 2016. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique". The seller is "950e" and is located in Washingtonville, New York. This item can be shipped to United States.