21 jewel Illinois Penn Special from 1923 with a Guilloche Dial

$3,300.00

This timepiece is a pocket watch conversion, and the movement can be seen through the caseback. The timepiece features 21 jewels, a guilloche metal dial, and original golden movement accents.

This piece is in our 44 mm conversion case, learn more about case size and profile.

*Every detail—from servicing, restoring, repairing and casing—is completed in our shop in Little Rock, Arkansas, USA*

This timepiece is a pocket watch conversion, and the movement can be seen through the caseback. The timepiece features 21 jewels, a guilloche metal dial, and original golden movement accents.

This piece is in our 44 mm conversion case, learn more about case size and profile.

*Every detail—from servicing, restoring, repairing and casing—is completed in our shop in Little Rock, Arkansas, USA*

Illinois Watch Co. was in operation from 1869-1948 and produced some of the most renowned railroad-grade movements ever manufactured. Watches were produced in their factory in Springfield, Illinois.

Illinois pocket watch conversion

This Illinois timepiece was completed in Springfield, Illinois, in 1923 and features an original metal dial with an intricate guilloché pattern at its center. Bold Arabic numerals line the perimeter, complemented by a clearly defined railroad minute track with prominent markers at five-minute intervals. The influence of American railroad watch design is unmistakable, with an emphasis on clarity, precision, and legibility. The original heat-blued hands provide striking contrast against the metal dial, bringing together color, texture, and traditional American watchmaking in a way that feels unmistakably Illinois.

Illinois pocket watch conversion

Beneath the dial is the Penn Special, Illinois Grade 274, a 21-jewel, in-house movement with private-label branding. The movement was fully serviced and restored in our workshop in Little Rock, Arkansas. Each plate was carefully hand polished to remove surface oxidation while preserving the original golden accents applied by Illinois at the time of manufacture. The jewel chatons, gear train, balance, and balance weights were individually hand polished to restore their original warm, golden tone. Across the plates, crisp damaskeening runs in a sunburst-like pattern creating depth and contrast as light moves across the movement.

The timepiece is encased in a 316L stainless steel watch conversion case, designed with adjustable lugs for easy winding and setting, ensuring a comfortable fit across various wrist sizes. The case includes front, back, and crown gaskets, providing water resistance up to 50 meters, though it is recommended to remove the watch before engaging in water activities. The timepiece comes fully serviced and ready for your future adventures.

Watch Performance

  • Accuracy: +/- 10 seconds per day

  • Amplitude: 300 degrees

  • Beat Error: 1.5 ms

  • Frequency: 18,000 (5 beats per second)

  • Power Reserve: 24-30 hours

  • Complication: Sub second hand

 

Watch Specifications

  • Manufacture: Illinois

  • Location: Springfield, Illinois

  • Year Manufactured: 1923

  • Dial Material: Metal

  • Jewels: 21 jewels

  • Case Diameter: 44 mm

  • Front Crystal: Domed AR coated sapphire

  • Back Crystal: Flat AR coated sapphire

  • Case Material: 316L stainless

  • Lug width: 22 mm

  • Lug to Lug: 47 mm (52 mm with crown)

  • Height: 13 mm

  • Serial Number: 4353610

  • Water Resistance: 50 meters

  • Warranty: Full 1-Year Warranty

All Frett & Co. Clockworks watches come with a full 1-year warranty unless otherwise stated.