Illinois Watch Co. Grade 187 pocket watch movement no. 1569915
Record status
Individual type · partial
Period
ca. 1901
This pocket watch movement was produced by the Illinois Watch Company under Grade 187, Model 4, bearing serial number 1569915 and dated to circa 1901. It is configured in the 16-size Getty style with a single visible winding wheel and three parallel finger bridges supporting the wheel train.
The nickel-finished movement plates feature sunburst-pattern damaskeening. Visible markings include 'Adjusted' inside an engraved banner, 'TEMPERATURE / 6 POSITIONS / ISOCHRONISM', and '17 Ruby Jewels' along the outer rim. The movement features a balance with timing screws, an engraved balance cock, and a micrometer regulator mechanism.
Evidence at a glance
- Linked sources
- 1
- Photograph views
- 1
- Catalogue references
- 0
Counts describe this entry’s documentation, not authenticity, rarity or completeness. Photographs may show one specimen; check each caption and licence.
Technical characteristics
- Date
- ca. 1901
- Type
- Pocket watch movement
- Maker
- Illinois Watch Co.
- Markings
- Adjusted Temperature 6 Positions Isochronism
- Jewel count
- 17 jewels
- Place recorded
- United States
- Maker / attribution
- Illinois Watch Co.
Design
- Visible features
- • Serial number 1569915 is engraved along the outer edge of the movement plate. • The barrel bridge is marked 'ADJUSTED' in an arched banner above 'TEMPERATURE / 6 POSITIONS / ISOCHRONISM'. • Outer plate perimeter is engraved '17 Ruby Jewels'. • Three distinct parallel finger-style bridges support the wheel train above the single visible winding wheel.
- Identity and Classification
- Movement serial number 1569915 is documented as an Illinois Watch Co. Grade 187, Model 4 hunting movement dating to circa 1901. Earlier factory tables published in reference guides recorded this production run as single-roller mechanisms marked simply 'Adjusted'. However, research identifies this movement as part of an amended mixed run of 200 Model 4 movements ranging from serial numbers 1569801 to 1570000. Instead of bearing only the standard minimal adjustment marking, movement 1569915 is classified under Line 1b of the amended data as an example bearing specific inscriptions indicating adjustment to six positions.
- Visible Movement Construction and Finishes
- The movement is built in the 16-size Getty design configuration, identified by a single visible winding wheel and three distinct parallel finger-style bridges supporting the wheel train. The nickel-finished plates are decorated with a sunburst damaskeening pattern, accompanied by an engraved balance cock, a balance wheel fitted with timing screws, and a micrometer regulator mechanism. Direct visual inspection reveals serial number 1569915 engraved along the outer plate perimeter, alongside the inscription '17 Ruby Jewels'. The barrel bridge is engraved with 'ADJUSTED' framed within an arched banner above 'TEMPERATURE / 6 POSITIONS / ISOCHRONISM'.
- Escapement and Archival Classification Context
- Archival listings in the 'Illinois Watch Co Encyclopedia and Price Guide' and the 'Illinois Database' originally classified movements in this serial range as single-roller escapements marked only 'Adjusted'. Photographic evidence for movement 1569915 demonstrates an expanded marking reading 'Adjusted Temperature 6 Positions Isochronism'. The source classifies this movement as retaining a single roller escapement. However, internal roller table components beneath the balance assembly are not directly observable in the top-plate view and rely on the source's cataloguing and production run analysis.
Identification
- Reference
- Grade 187, Model 4
- Serial number
- 1569915
- Source note
- Facts transcribed from the linked source listing or collection record. Attribution and specifications are source-reported and have not been independently authenticated.
Catalogue references
No catalogue numbers recorded. Numbers are only published once transcribed from a verified edition of a standard catalogue — they are never inferred.
Research required
- Research required: The movement is shown uncased without an accompanying dial, hands, or case.
- Research required: Specific image photographer credit is not individually cited for Figure 5.