Jewels are difficult minerals which are put into the mechanics from the watch to avoid put on at pivot and collision points. Generally, the jewel count is really a direct symbol of quality.
Almost all American Pocket Watches contain a minimum of 7 jewels, that are situated inside the balance set up:
- 2 Balance Staff Hole Jewels
- 2 Balance Staff Cap Jewels
- 1 Impulse/Curler Jewel
- 2 Pallet Jewels
7-Jewel actions can be simply recognized by the possible lack of hole jewels in the pivots on top plate. Rather, the holes are metal bushings.
7-Jewel actions are certainly not marked using the jewel count.
Additionally towards the 7 jewels situated inside the balance set up, 11-jewel watches contain among the two following qualities:
- 2 Pallet Fork Hole Jewels and a pair of Escape Wheel Hole Jewels
- Or 4 Top Plate Hole Jewels for that Pallet Fork, Escape Wheel, 3rd Wheel, and fourth Wheel (Without matching hole jewels at the base plate)
Because some producers generally jeweled the very best plate only, when the movement isn't marked having a jewel count, elimination of the dial is generally needed to look for the accurate count.
Tip: Oftentimes, 11-jewel actions which are only jeweled on top plate is going to be friction/pressed jewels and become indicated having a plain regulator, while 15-jewel actions may have screw-set jewels and sure a micrometer regulator. However, this isn't always the situation.
11-Jewel actions are nearly never marked using the jewel count.
Additionally towards the 7 jewels situated inside the balance set up, 15-jewel watches contain:
- 2 Pallet Fork Hole Jewels
- 2 Escape Wheel Hole Jewels
- 2 3rd Wheel Hole Jewels
- 2 fourth Wheel Hole Jewels
15-Jewel actions are occasionally marked using the jewel count.
Additionally towards the 15 jewels as indicated above, 17-jewel watches contain:
- 2 Center Wheel Hole Jewels
Some producers created 16-jewel actions that may be easily wrongly identified as 17-jewels. These actions possess a hole jewel for that center wheel on top plate, but don't have a matching jewel at the base plate. Thus, elimination of the dial is generally needed to look for the accurate count unless of course home plate is marked as "17 Jewels."
17-Jewel actions are often marked using the jewel count.