The Model 5 Jeweling

Diagram of a mechanical watch movement with numbered components.

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 possible 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 escape wheel, always with an odd number of teeth
The pallet fork with entry and exit stones
The balance wheel, which carries the roller jewel

The Model 5 Counts

7-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

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

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

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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