Catalogue record · Pocket watch
Illinois Bunn Special
Partially verifiedIllinois's flagship railroad grade, named for the company president Jacob Bunn, and one of the most collected American railroad watches.
Overview
The Bunn Special was Illinois's premium railroad line. Later production included grades advertised for a sixty-hour run, an unusual selling point in an industry where thirty to forty hours was normal.
Grade markings, jewel counts and dial types vary substantially across the production life, so the name alone does not identify a specific specification.
History
Illinois competed directly with Hamilton, Elgin and Waltham for railroad approval, and the Bunn and Bunn Special names carried that competition into marketing.
Illinois was acquired by Hamilton in the late 1920s and Springfield production ended in the 1930s, which makes late Bunn Special production a closing chapter of American factory watchmaking.
Design
Railroad conventions: lever setting, open-face case, plain legible dial.
Later grades emphasise a long power reserve and elaborate damascening on the plates.
Movement
Higher jewel counts in the top grades include jewelling of the barrel arbor and additional train pivots.
Motor barrel arrangements appear in some later American high grades; verify the specific grade before asserting which barrel a given movement uses.
Case
Many Bunn Specials are found in later cases; original pairings are not guaranteed by the American trade practice of selling movements separately.
Dial and hands
Reproduction railroad dials exist in quantity; inspect printing quality, sinking and the fit of the dial feet.
Technical specifications
| Movement | Illinois Bunn Special, 16 size (earlier 18 size grades exist) |
|---|---|
| Movement type | Bridge, lever-set, stem-wind |
| Escapement | Lever escapement |
| Jewels | 19, 21 or 23 jewels depending on grade |
| Winding and setting | Stem-wind, lever-set |
| Size | 16 size (also earlier 18 size) |
| Power reserve | The 60-hour grades were built and marketed for a longer run between windings |
| Frequency | 18,000 vibrations per hour (2.5 Hz) |
| Accuracy | Adjusted railroad grade; rates depend entirely on service condition |
| Complications | Running seconds |
| Size | 16 size (earlier 18 size) |
| Jewels | 19 / 21 / 23 by grade |
| Setting | Lever-set |
| Notable grade feature | 60-hour grades advertised for extended running |
Identification
- Movement marked with the Illinois name and the Bunn Special grade name; 60-hour grades are usually marked as such.
- Check jewel count marking against the grade claimed by a seller.
Variations
- 18 size earlier grades, 16 size later grades, and jewel-count variants within each.
- Sixty-hour marked grades and later Hamilton-era production.
Serial numbers and dating
- Illinois serial-number tables are published in the standard American references and give approximate years.
- Grade attribution should come from the movement markings, not from the serial number alone.
Known examples and institutional holdings
- Common in private American railroad watch collections; institutional holdings exist in regional Illinois museums and historical societies.
Collecting
- Strongly collected by grade and by dial variant. Fakery concentrates on dials and on grade markings, so buy the movement, not the story.
Restoration and conservation
- Long-power-reserve grades place particular demand on mainspring selection; use a watchmaker who knows the grade.
- Movement work — cleaning, lubrication, mainspring replacement, pivot or jewel work — belongs with a qualified watchmaker. Conserve original parts; do not refinish dials or polish cases to remove honest wear.
Bibliography
- Standard American pocket watch references with Illinois grade and serial tables (edition-dependent).
Bibliographic entries are given only at the level we can support. Where an edition, publisher or ISBN is not confirmed, it is deliberately omitted rather than invented.
Photographs
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Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.
Sources & references
- Published Illinois grade and serial-number references.
- Company histories of the Illinois Watch Company and its acquisition by Hamilton.
Where sources disagree, the disagreement is stated rather than resolved silently.