Now available at auction from Second Vintage The Citizen Crystal Seven stands as a true milestone in mid-century Japanese horology, celebrated for its advanced engineering and striking aesthetic. Introduced in the mid-1960s, the Crystal Seven line was renowned for utilizing remarkably thin automatic movements that allowed for elegant case profiles, alongside the pioneering use of mineral glass crystals in the Japanese market. This particular example showcases the highly desirable day-at-12 layout, accented by the distinctive applied '7' shield logo, offering collectors a sophisticated and historically significant timepiece that perfectly captures the charm of vintage Citizen design. Brand: Citizen Model: Crystal Seven Reference Number: ACSS2803-Y Serial Number: 71201135 Movement: Automatic Caliber 5204, 21 Jewels Dial: Silver sunburst dial with applied faceted block indices, a framed day window at 12 o'clock, and a date aperture at 3 o'clock, showing excellent preservation with minor age-consistent spotting Case Size: 35 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1960s Condition: Excellent vintage condition with a sharply defined case and a beautifully preserved dial Dial and Hands The watch features a brilliant silver dial with a radiant sunburst texture that catches the light beautifully from every angle. The dial furniture is highly detailed, consisting of prominently raised, faceted block indices featuring distinctive black central stripes that provide excellent legibility and visual contrast. At the 12 o'clock position sits a unique, curved framed day window, perfectly balanced by the date aperture at 3 o'clock and the iconic, textured applied '7' shield logo at 6 o'clock. The typography is precise, with the bold sans-serif "CITIZEN" signature contrasting elegantly against the sweeping, vintage serif script of the "Crystal Seven" text. The dauphine-style hands match the indices perfectly, featuring identical black central stripes. Upon close inspection, the dial remains exceptionally clean overall, though it exhibits minor, honest age-consistent spotting near the outer edges and slight oxidation on the hands, adding genuine vintage character without detracting from the watch's striking presence. Case and Crystal The tonneau-shaped stainless steel case is a superb example of 1960s geometry, featuring a sharp, flat upper surface with a pronounced linear brushed finish that contrasts brilliantly against the polished case flanks and bezel. The transitions between the brushed and polished surfaces remain crisp and well-defined, indicating respectful wear over the decades. The crystal sits slightly proud of the bezel, offering a clear and undistorted view of the dial beneath. The screw-down caseback is deeply engraved and highly legible, displaying the "PARA WATER" and "STAR" designations alongside the Crystal Seven emblem, reference ACSS2803-Y, and serial number. The case exhibits honest signs of vintage wear, including superficial scratches and minor handling marks on the polished sides, but retains its strong architectural integrity. The fluted crown provides easy operation for time setting and winding. Movement Powering this timepiece is the Citizen automatic Caliber 5204, a 21-jewel mechanism renowned for its slim profile and reliable performance. Visual inspection of the movement reveals a clean architecture, with the winding rotor proudly stamped "CITIZEN 21 JEWELS" and the mainplate bearing the "5204" caliber designation. The components present well, with the balance wheel and regulating mechanism clearly visible and intact. Exhibiting remarkable accuracy and consistency, performing brilliantly for a vintage timepiece. Timegrapher results show a variance of -11 to -15 seconds per day. Strap The watch is fitted with a period correct stainless steel bracelet in a classic beads-of-rice configuration. The multi-link design provides excellent articulation and a comfortable drape on the wrist. The folding clasp operates securely and matches the overall vintage aesthetic of the timepiece, showing light surface wear consistent with the condition of the case. Accommodate a wrist size of up to approximately 18 cm in circumference. Condition This Citizen Crystal Seven is presented in excellent vintage condition. The dial has aged gracefully, maintaining its vibrant sunburst finish while displaying only minor, localized spotting indicative of its era. The stainless steel case retains its sharp factory lines and distinct contrast between brushed and polished finishes, showing only standard, superficial handling marks. The movement is remarkably clean and running with exceptional vintage precision. Dimensions Case width: 35 mm (excluding the crown) Remarks Combining a sophisticated sunburst dial, a sharply angled tonneau case, and a remarkably thin automatic movement, this Crystal Seven is a testament to Citizen's golden era of mechanical watchmaking. The prominent day display and signature shield logo make it an instantly recognizable and highly wearable piece for any enthusiast of Japanese vintage horology. History Launched in 1965, the Crystal Seven series represented a major leap forward for Citizen. It was marketed as the world's thinnest automatic watch with a day and date complication at the time of its release. Furthermore, it earned its name by being the first domestically produced Japanese watch to feature a mineral crystal, moving away from the easily scratched acrylic crystals that dominated the industry. The line became a massive success, beloved for its modern styling, reliable in-house calibers, and the sheer variety of dial designs, cementing its status as a true classic in the brand's expansive archive. 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: CIT-CSX-0001