Available now on auction by Second Vintage The mid-century era of watchmaking produced some of the most elegant and structurally striking dress watches, and this square-cased Longines is a superb testament to that design philosophy. Blending geometric austerity with refined textures, this timepiece captures the sophisticated essence of late 1960s horology. With its sharp lines, in-house mechanical pedigree, and a beautifully preserved vertically brushed dial, it offers collectors a highly wearable and aesthetically captivating slice of Longines history. Brand: Longines Reference Number: 7757-3 Serial Number: 14210230 Movement: Longines Caliber 428, manual-winding, 17 jewels Dial: Vertically brushed silver with applied black baton indices and applied winged hourglass logo, exceptionally clean condition Case Size: 29 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1960s Condition: Excellent vintage condition with sharp case geometry and an outstandingly preserved dial. Movement have been serviced 6/25/2026 and performs strongly. Dial and Hands The dial is a masterclass in mid-century minimalism, featuring a striking vertical brushed silver surface that plays beautifully with the light. It is adorned with applied black baton hour markers at the cardinal positions, interspersed with fine, printed black lines for the remaining hours. The typography is crisp, with the serif Longines signature positioned just above a finely faceted, applied winged hourglass logo. The time is indicated by a set of matching black baton hands that provide excellent contrast against the silver backdrop. Upon close inspection, the dial remains in exceptionally well-preserved condition, showing only the faintest micro-specks visible under high magnification, while entirely avoiding any moisture damage, staining, or print loss. It presents a remarkably clean and fresh appearance. Case and Crystal The square stainless steel case is defined by its strong geometric presence and wide, flat bezel framing the dial. The case retains sharp, well-defined factory lines, showcasing a beautiful contrast between the vertically brushed upper surfaces and the highly polished case flanks. The watch is fitted with its original signed Longines crown, which bears both the brand name and the winged hourglass logo in crisp relief. A flat crystal protects the dial, sitting flush with the case and remaining clear of any deep scratches or distracting marks. The snap-on caseback exhibits honest, light handling wear consistent with its age, while the interior is beautifully finished with perlage and bears the correct Longines factory engravings and reference numbers. Movement Powering this elegant timepiece is the Longines Caliber 428, a meticulously finished 17-jewel manual-winding movement. The movement architecture is classic and refined, with the bridges showing clean, bright surfaces. The caliber number 428 is clearly stamped in a gold-toned rectangular cartouche, alongside the serial number 14210230, which places its production in the late 1960s. Exhibiting remarkable accuracy and consistency, performing brilliantly for a vintage timepiece. The timegrapher results indicate a highly impressive performance of +8 to +10 seconds per day with strong amplitude, reflecting the enduring quality of Longines' mid-century mechanical engineering. Movement have been serviced 6/25/2026 and performs strongly. Strap The watch is paired with a black, heavily grained textured leather strap that perfectly complements the sharp, monochromatic aesthetic of the steel case and silver dial. The strap features contrasting white stitching along the edges, adding a touch of casual elegance to the formal square profile, and is secured with a standard stainless steel buckle. Condition This Longines is presented in excellent vintage condition. The case retains its structural integrity with sharp edges and distinct transitions between its brushed and polished finishes, showing only minor, superficial handling marks expected from careful occasional wear. The dial is the standout feature, remaining incredibly clean and vibrant with no significant aging or flaws. The movement is visually pristine and mechanically robust, making this a collector-grade example of a classic square dress watch. Dimensions The stainless steel case measures 29 mm in width, excluding the signed crown. Due to its square geometry and wide bezel, the watch carries a larger visual presence on the wrist than its dimensions might suggest, offering a classic and highly tailored fit for a variety of wrist sizes. Remarks Square dress watches from the 1960s represent a distinct era of design where elegance was achieved through proportion and texture rather than sheer size. This Longines perfectly encapsulates that ethos. The combination of the brushed silver dial, the stark black applied markers, and the beautifully preserved case makes this a highly versatile timepiece that transitions effortlessly from formal attire to elevated casual wear. History During the mid-20th century, Longines was operating at the peak of its powers, producing movements and designs that rivaled the top tier of Swiss watchmaking. The brand was particularly renowned for its elegant dress watches, which favored slim profiles, refined textures, and reliable in-house calibers. Watches like this square reference 7757 were born in an era when geometric case shapes were highly fashionable among the global elite, representing a departure from traditional round cases and signaling a modern, forward-thinking approach to horological design. Payment and Shipping Payment must be completed within 1–3 days after purchase. Your watch will be professionally and very securely packaged, and shipped with tracking and insurance for your peace of mind. We ship via fast express service, with typical delivery in 1–4 business days (destination dependent). Note that with vintage watches, minor signs of wear, aging, or imperfections may be present and are considered normal for watches of this age. Please review all photos carefully before bidding. We strive to photograph each watch from multiple angles for the most accurate representation. The photos form an important part of the description. If there are any concerns of functionality or defects after delivery, make sure to contact us within 3 days of receiving the watch so we can assist you. As with all vintage watches, water resistance is not guaranteed. If you have any questions, feel free to contact us after the auction ends. / Second Vintage SKU: LON-LXX-0028