Vintage GRUEN Precision Autowind Military Watch Cal. 460SS Bumper Automatic Guildite Case - SERVICED!

Watch Overview

Discover the Gruen Precision Autowind — a vintage military-style (field) wristwatch powered by the Gruen Caliber 460SS bumper automatic. The clean white dial features bold Arabic numerals, an outer minute/seconds track, and a central sweep seconds hand for clear legibility. True to its utilitarian roots, this piece combines functional design with mid-century charm.

Housed in a 31.5mm rugged Guildite case (Gruen’s proprietary alloy with matte/brushed finish), the watch delivers the crisp, tool-watch aesthetic collectors love. Recently SERVICED by our watchmaker, it is running well and ready to wear.

Product Details

General Specifications

• Brand: Gruen
• Type: Wristwatch
• Model: Precision Autowind (Military / Field)
• Reference: -
• Year / Era: Mid-20th Century (Vintage)
• Gender: Men's
• Country of Manufacture: Switzerland

Dial & Display

• Display: Analog
• Color: White / silvered matte
• Features: Arabic numerals, outer minute/seconds track, central sweep seconds, luminous hands

Movement

• Type: Automatic (bumper)
• Caliber: Gruen 460SS
• Jewels: -
• Movement Functions:
  • Self-winding bumper rotor
  • Central hours and minutes
  • Central sweep seconds
• Power Reserve: 34-hours
• Frequency: 18,000vph

Case & Band

• Material: Guildite case (matte/brushed alloy)
• Case Size: 31.5mm
• Case Shape: Round field-watch case with drilled lugs
• Bezel: Fixed
• Crystal: Acrylic
• Back: Snap back
• Crown: Push-pull
• Water Resistance: Not rated (vintage)
• Band Type: Black leather two-piece strap (aftermarket)

Additional Info

• Box & Papers: NO
• Condition: Vintage serviced condition — dial with honest patina and light marks; case shows light wear consistent with age; luminous material aged. Fully functional post-service.
• Extras: Recently SERVICED by our watchmaker; running well and ready to wear.

Extended Details

Movement Markings:	Case Back Markings:	Measurements (mm):
Gruen Precision – Cal. 460SS (bumper automatic) – Swiss	Guildite case; typical plain/signed snap back	Case Diameter 31.5 Case Diameter w/Crown 34 Lug to Lug 39 Case Thickness 11 Lug Width 16 Band Width 16

History & Legacy of Gruen

Founded in 1874, Gruen became one of America’s most important watchmakers, blending Swiss movement manufacture with U.S. design and distribution. The company’s Precision line represented its commitment to dependable, everyday timekeeping. Autowind models with bumper mechanisms—like the Caliber 460SS—capture a pivotal era when automatic wristwatches were evolving from novelty to mainstream reliability.

This Gruen Precision Autowind pairs a practical military/field dial with the characterful feel of a bumper automatic and the distinctive Guildite case finish. Fresh from service, it’s an excellent choice for collectors seeking a wearable slice of mid-century watch history.

About Second Hand Horology

At SECOND HAND HOROLOGY, we offer a curated selection of watches ranging from vintage to modern, including both brand-new and pre-owned timepieces. We’re committed to quality, accuracy, and integrity. Our listings feature:

Professional, unedited photography and clear, transparent descriptions. Every watch is thoroughly inspected and securely packaged to ensure a confident, seamless buying experience.

We also warmly invite you to visit our physical shop and explore the collection in person.

Contact Us

We appreciate you checking out our listing! Don’t hesitate to reach out with questions, offers, or just to talk watches — we love what we do and enjoy connecting with fellow enthusiasts.

Thank you for your business—we truly appreciate your support and look forward to serving you again in the future!

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