Rockford pocket watch dating
Suddenly, watches reflected the correct time within minutes rather than being off by close to an hour. A hand to measure seconds was added a little less than a century later.
As years passed, the customer's appetite for more and more gadgets on pocket watches led to the addition of calendars (marking the day, date and month), phases of the moon, alarms, chimes and music.
Today, the number of jewels a watch has is a sign of its quality and durability.
Finding a pocket watch made prior to 1700 is rare these days. Antique watches crafted before 1865 are very popular.
English watchmakers added jewels (gemstones) in the 1700s as bearings in the watches to prevent friction and wear between metal parts.
The first solution to uneven unwinding came when watchmakers realized the spring uncoiled at a more constant pace when it was not wound tightly.
Various means of preventing this were invented: the stackfreed was a cam with an additional spring that compensated for the main spring's changes in speed, and the fusee was a stop that prevented the spring from being wound too tightly. In 1675 several watchmakers discovered that a spiral spring attached to the balance greatly increased accuracy.
The manufacturer's name or mark is usually found on a pair case.
If it doesn't match the name on the watch, then the pair case is not the original, but a replacement.