Presented for auction by Second Vintage The Citizen Crystal Seven stands as a proud milestone in Japanese watchmaking, capturing the mid-century race for technical innovation and refined everyday elegance. Introduced in the mid-1960s, the Crystal Seven line was celebrated for being exceptionally thin for a day-date automatic and for its pioneering use of hardened mineral glass, an upgrade over the standard acrylic plexiglass of the era. With its distinct top-mounted day window, elegant proportions, and reliable in-house mechanics, this timepiece represents a sophisticated and highly collectible era of Citizen’s rich heritage. Brand: Citizen Model: Crystal Seven Reference Number: 4-000307 Serial Number: 70311088 Movement: Automatic, 27 Jewels, Caliber 5204 Dial: Silver sunburst dial with applied indices and framed day-date windows, presenting in beautifully crisp and clean condition. Case Size: 36 mm (excluding the crown) Case Material: Stainless steel Production Year: March 1967 Condition: Good vintage condition with honest case wear and a remarkably well-preserved dial. Dial and Hands The dial is a masterclass in mid-century Japanese design, featuring a brilliant silver sunburst finish that radiates beautifully under light. It is exceptionally well-preserved, remaining incredibly clean with only the faintest signs of natural aging visible under magnification. A prominent, faceted metallic frame highlights the day window located elegantly at the 12 o'clock position, sitting just above the applied "CITIZEN" script. At 3 o'clock, a crisp date aperture balances the layout. The applied baton indices are faceted and feature black center inserts, which perfectly harmonize with the central dauphine hands that carry matching black stripes. The applied "7" shield logo at the lower half of the dial adds a striking touch of character, accompanied by the classic "Crystal Seven" typography. Case and Crystal The 36mm stainless steel case features classic proportions, characterized by gracefully sweeping lugs and a distinctive fluted bezel that catches the light from every angle. The case exhibits honest, age-consistent wear, with surface scratches and softening of the lug edges indicating a life of regular use without aggressive over-polishing. The fluted bezel shows moderate rubbing but retains its attractive textured profile. The original signed "CTZ" crown sits securely at the 3 o'clock position. The flat crystal, the namesake feature of this model line, displays visible edge wear, micro-chipping along its outer perimeter, and scattered surface scratches. These honest imperfections authenticate its vintage journey while still allowing the pristine dial beneath to be fully appreciated. Movement Powering this timepiece is the Citizen in-house Caliber 5204, a 27-jewel automatic movement known for its durability and efficient winding. The movement presents beautifully in the macro photography, showcasing clean plates, a brushed automatic winding rotor, and clearly visible factory engravings. Running in vintage operational condition. Maintains the authentic mechanical character of the era, with the timegrapher recording a performance of -51 to -60 seconds per day. Strap The watch is fitted with a handsome black leather strap featuring contrasting brown stitching, complementing the subtle black accents on the dial and hands. The strap is secured with a classic stainless steel pin buckle. Condition This Crystal Seven is in good vintage condition, offering a highly appealing mix of honest exterior wear and a stunningly preserved dial. The stainless steel case and fluted bezel show expected surface marks and softening from decades of wear. The dial is the undisputed star, remaining bright, clean, and free of moisture damage or prominent spotting. The flat crystal shows noticeable edge chips and surface wear, consistent with an unpolished and well-enjoyed vintage tool. Dimensions The stainless steel case measures 36 mm in diameter excluding the crown. Remarks Combining a sophisticated day-date layout with an iconic fluted bezel, this Citizen Crystal Seven is a versatile and historically significant piece. It offers collectors a robust mechanical experience and a timeless aesthetic that easily transitions from casual to formal settings, making it a compelling addition to any vintage Japanese watch collection. History Debuting in 1965, the Citizen Crystal Seven broke new ground as the world's thinnest automatic watch equipped with a day and date complication. It was also a pioneer in utilizing hardened mineral glass crystals instead of the easily scratched acrylic plexiglass that dominated the industry, proudly adopting the "Crystal" moniker to highlight this technological advancement. The Crystal Seven series became a massive commercial success for Citizen, cementing the brand's reputation for combining forward-thinking engineering with accessible, high-quality 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: CIT-CCS-0006