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The Model 5 Jeweling
Jeweling Locations
Use this page to visually compare your Model 5 Seth Thomas against these examples, paying attention to which positions have jewels and which ones have bushings. There are only seven locations:
- The mainspring barrel, which provides power
- The center (second) wheel, which drives the hands
- The third wheel between the center and fourth wheels
- The fourth wheel, which holds the seconds hand
- The steel or bronze escape wheel
- The pallet fork with entry and exit stones
- The balance wheel, which carries the roller jewel
The Model 5 Counts
7-Jewel
11-Jewel
11-Jewel
- 2 balance staff hole jewels
- 2 balance staff cap jewels
- 2 pallet stones (1 entry and 1 exit)
- 1 roller jewel
The entire gear train has metal bushings.
All jewels are on the balance assembly.
Grades 47 and 57 only.
11-Jewel
11-Jewel
11-Jewel
- 2 balance staff hole jewels
- 2 balance staff cap jewels
- 2 pallet stones
- 1 roller jewel
- 1 hole jewel for the pallet staff, the escape wheel, and the 3rd and 4th wheels, for a total of four
Press-fit jewels only on the upper plate.
15-Jewel
11-Jewel
15-Jewel
- 2 balance staff hole jewels
- 2 balance staff cap jewels
- 2 pallet stones
- 1 roller jewel
- 1 pair of hole jewels for the pallet staff and the escape, 3rd, and 4th wheels, for a total of eight
Note that the count isn't marked and that the center wheel has a bushing and not a jewel.
17-Jewel
17-Jewel
15-Jewel
- 2 balance staff hole jewels
- 2 balance staff cap jewels
- 2 pallet stones
- 1 roller jewel
- 1 pair of hole jewels for the pallet and the escape, 3rd, 4th, and center wheels, for a total of ten
The earliest variants were not marked. Note that the center wheel now has jewels.
21-Jewel
17-Jewel
21-Jewel
- 2 balance staff hole jewels
- 2 balance staff cap jewels
- 2 pallet stones
- 1 roller jewel
- 1 pair of hole jewels for the pallet and the escape, 3rd, 4th, and center wheels, for a total of ten
- 1 pair of cap jewels for the pallet arbor and the escape wheel, for a total of four
23-Jewel
17-Jewel
21-Jewel
- 2 balance staff hole jewels
- 2 balance staff cap jewels
- 2 pallet stones
- 1 roller jewel
- 1 pair of hole jewels for the pallet and the escape, 3rd, 4th, and center wheels, for a total of ten
- 1 pair of caps for the pallet and escape wheel, and 1 each on the upper 3rd and 4th wheels, for a total of six
24-Jewel
24-Jewel
- 2 balance staff hole jewels
- 2 balance staff cap jewels
- 2 pallet stones
- 1 roller jewel
- 1 pair of hole jewels for the pallet and the escape, 3rd, 4th, and center wheels, for a total of ten
- 1 pair of caps for the pallet arbor, escape and 3rd wheel, and 1 on the 4th wheel, for a total of seven
25-Jewel
24-Jewel
- 2 balance staff hole jewels
- 2 balance staff cap jewels
- 2 pallet stones
- 1 roller jewel
- 1 pair of hole jewels for the pallet and the escape, 3rd, 4th, and center wheels, for a total of ten
- 1 pair of cap jewels for the pallet arbor, escape and 3rd wheels, and one on the upper 4th wheel for a total of seven
- 1 hole jewel for the upper mainspring barrel
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