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The first thing you notice on this Gruen is not the dial, the case shape, or even the gold-filled finish. It is that the crown is at twelve. We have always found the top-crown configuration to be one of the quietly clever solutions of mid-century American watch design, a piece of geometry that solves the small-but-real ergonomic problem of a crown digging into the back of your hand while also giving the case a perfectly symmetrical silhouette on the wrist. The Ref. 400-298 puts that thinking inside a stepped tonneau case in 10K gold filled, and to us it is one of the more characterful 1940s dress Gruens you can pick up at this size and price.
Gruen itself sat in a fascinating spot in early-twentieth-century American watchmaking. Founded in 1874 by Dietrich Gruen, the company built a transatlantic operation that designed and assembled in Cincinnati while running its own movement manufactory in Biel, Switzerland, a facility the family famously referred to as Time Hill. That structure let Gruen pair Swiss movement work with American case design sensibilities, and during the 1930s and 1940s the brand leaned hard into stepped, sculpted, asymmetric case shapes that read distinctly American even when the movements inside were Swiss to the core. The top-crown layout was one of the more unusual case ideas Gruen took to market, and it survives today as a quietly clever curiosity rather than a mainstream design language.
The movement here is a 17 jewel Gruen Watch Co. caliber, signed across the bridge in script that reads “GRUEN WATCH C°” with “SEVENTEEN 17 JEWELS” sitting just below. The plates carry a granular, perlage-style finish across the bridges rather than the more decorative striping you would expect on a higher-tier caliber of the era, which is consistent with how Gruen built its mid-tier dress calibers: well-jeweled, properly damaskeened, but not overdressed for a watch that was always meant to be a daily wearer for a working professional rather than a showpiece for an exhibition caseback that never existed. The balance wheel and ruby jewels are clearly visible in the movement shot, and several watchmaker service marks scratched into the inner caseback alongside the factory stampings tell you what we already suspect, which is that this watch was used, maintained, and kept running through decades of regular service rather than left in a drawer.
The case is signed by the Star Watch Case Co., the long-running American case maker that produced many of Gruen’s gold-filled cases during this era. The inner caseback carries a beautifully clear set of stampings that read “CASED AND TIMED IN U.S.A. BY GRUEN WATCH CO. STAR WATCH CASE CO. 10K GOLD FILLED” along with case number 56938 and reference 400-298. The outer caseback shows a single small “10K GOLD FILLED” stamp at twelve and has picked up the kind of soft brushing across its face that comes from sliding onto a shirt cuff for thousands of mornings. The case measures 26mm across the cushion and 33mm lug-to-lug with 15mm lug spacing, dimensions that read genuinely small by modern standards but feel correctly proportioned on a 1940s dress-watch wrist. The stepped Art Deco shoulders at the lug ends are still well defined, the case flanks show light scratching consistent with a 10K gold filled finish that has been worn rather than babied, and the top crown threads and winds cleanly.
The dial is a warm silvered cream that has aged with real character. Full Arabic numerals one through twelve are printed in a golden-tan tone around the dial, with a fine hash-mark minute track running the outer perimeter and the GRUEN signature printed cleanly below twelve. The SWITZERLAND notation sits just inside the six o’clock numeral, partially visible against the aged dial finish. The hands are gold-toned leaf style with a subtle taper, set on a central pinion above a small applied jewel cabochon, and they have picked up just enough oxidation across their length to read as period-correct rather than glossy or refinished. There is no lume anywhere on the dial or hands, which is exactly right for a 1940s American dress Gruen of this tier and removes one of the more common signs of restoration work on watches of this age. The dial reads honestly factory-original to us, with the gentle warmth of natural aging across the silvered surface and none of the spotting, flaking, or sharp tonal breaks that signal a refinish job.
We have set it on a brown alligator-grain leather strap that picks up the warm gold tones of the case and gives the small cushion proportions a confident, slightly traditional finish. The pairing leans into the 1940s dress character of the piece without making it feel costume-period, and the brown leather against the gold-filled lugs is a combination that ages forward well.
Serviced in-house at OTTUHR and backed by our 2-year mechanical warranty. For the collector who values clever American case design over the safer round-and-Roman conventions of the 1940s dress segment, and who appreciates a quietly executed 17 jewels Gruen running honestly on its original dial, this top-crown Ref. 400-298 is, to us, a wonderfully characterful entry point into the smaller but genuinely interesting world of mid-century Gruen.
