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Cincinnati, Ohio is where Gruen began in 1874, and Switzerland is where it ended up by the time this Precision left the bench. The watch in hand is the late expression of that transatlantic arc, an American sales identity in front of a Swiss manufacturing base, with the caseback stamped GRUEN WATCH Co. SWITZERLAND and the caliber 712 CA signed for Gruen underneath. In our opinion, this is one of the cleaner survivor configurations the Precision line produced in the years after Gruen’s manufacturing center had fully relocated, and on this example the dial has held its factory finish across roughly six decades with only a quiet warming across the silver.
Gruen was founded in 1874 by Dietrich Gruen, a German watchmaker who emigrated to the United States and set up shop in Cincinnati, Ohio, first as the Columbus Watch Company and then under his own name as D. Gruen & Son and ultimately Gruen Watch Co. By the postwar years the brand had fully committed its manufacturing to Switzerland while keeping its American sales identity, which is why a watch like the one in hand carries the Swiss caliber and the Gruen Watch Co. SWITZERLAND caseback stamping at the same time. The Gruen Precision 510 famously appeared on Sean Connery’s wrist in Dr. No in 1962, and the broader Precision line ran on from there through the rest of the decade as Gruen’s accessible workhorse signature, automatic and manual variants sharing the same restrained dress-watch vocabulary.
The headline mechanically is the Gruen-signed caliber 712 CA, a 25-jewel central-seconds automatic running at 18,000 vibrations per hour with a roughly 44-hour power reserve. As shown in our movement photographs, the rotor is stamped GRUEN WATCH Co. / 712 CA / PRECISION in a horseshoe arc across its visible face, with the brushed nickel finishing across the rotor surface and the unidirectional automatic architecture visible underneath. The CA designation in the Gruen caliber family is the calendar-equipped full-rotor configuration, distinct from the 712 SS micro-rotor sibling, and the date complication on this dial maps exactly to that mechanical layout. The 712 CA is a quietly capable workhorse caliber, the kind of mechanism that runs for decades between services if you treat it gently, and the example in hand has been gone through in our workshop and is running cleanly.
The 34.5mm round stainless steel case, 39mm lug-to-lug, 18mm lug width, is the late-1960s slim-case Gruen silhouette done in the way a vintage collector wants to find one today. The lug tops carry a sharp polished facet running the full length of each lug, contrasting against the brushed finish across the rest of the case and giving the watch a quiet jewelry-grade lift on the wrist. Light hairlines across the brushed surfaces and gentle marks on the polished facets record honest wear rather than abuse. The original Gruen-signed crown sits at three with the period-correct logo intact and pulls cleanly into the date-set and time-set positions. The screw-down caseback carries the circular band stamping STAINLESS STEEL CASE / GRUEN AUTOMATIC around the perimeter, and inside the back is signed STAINLESS STEEL / GRUEN WATCH Co. / SWITZERLAND, exactly the format the Swiss-made Gruen cases of this era used.
The dial is factory original. Applied chrome baton markers ring the dial at every hour position, each with a recessed central channel carrying an aged lume plot that has matured into a soft cream tone, and the small dot inside the printed minute track at every five-minute station carries the same matching cream patina. The handset is the factory dauphine configuration, broad sword-shaped hour and minute hands with central lume channels that have darkened into a warm honey tone matching the markers, and a slim chrome sweep seconds hand running cleanly across the surface. The printed GRUEN PRECISION signature at twelve and the 25 JEWELS AUTOWIND text at six both read crisply with no fade. The acrylic crystal sits proud above the dial with the gentle low dome that suits the slim-case profile.
We have paired the watch with one of our mud grey Saffiano leather straps with cream contrast stitching and an OTTUHR signed buckle. The mud grey picks up the warm cream of the aged lume without competing with the silver sunburst dial, and the Saffiano grain gives the package a slightly contemporary weight that lets the watch wear as comfortably with a modern shirt-cuff as it would have worn under a 1960s one.
Serviced in-house at OTTUHR and backed by our 2-year mechanical warranty, this is the kind of vintage Gruen Precision watch we get genuinely happy about pulling out of the case. Factory dial, original crown, matching handset, intact caseback stampings, and the Gruen-signed 712 CA running quietly underneath. For the collector who reads a dress watch by the integrity of its signatures rather than the size of its case, who appreciates the quiet design vocabulary of mid-1960s Swiss-made Gruen, and who wants a vintage automatic with a real American name and a real Swiss heart, this is exactly the kind of watch we love bringing in.
