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If the movement is asymmetrical, say oval or rectangular, it is measured at its narrowest point.
Note that the case is NOT included in this measurement, only the movement.
After the infamous collision between Lake Shore and Michigan Southern Railways at Kipton, Ohio, which allegedly occurred because an engineer's watch had stopped unnoticed for about 5 minutes, the railroad officials commissioned Webb C.
Ball as their General Time Inspector in order to establish precision standards and a reliable timepiece inspection system for Railroad Watches.
Webb Ball established strict guidelines for the manufacturing of sturdy, reliable precision timepieces, including resistance to magnetism, reliability of time keeping in 5 positions, isochronism, power reserve, accompanied with record keeping of the reliability of the watch on each regular inspection.
(6 available) Click this link for some information on these U. Beautifully engraved Solidarity 14K 0-size hunting case. Nice, all consistent and original, English silver pair case.
I'm including a model '88 stem and crown to complete the package. There is an extra gold disk behind it adding thickness to allow a diamond to be mounted.
Today's criteria for the certification of each COSC Officially Certified Chronometer are still based in part upon Webb C. The colloquial phrase "on the ball" purportedly derives from Webb C.
Ball's watch standards and their reputation for accuracy. Click here for an explanation and example of how to use our serial number tables. Click here for instructions on how to identify and open most common case types.