A Masterclass in Mid-Century Japanese Horology The Seiko 5 DX (Deluxe) represents a golden era of Seiko’s watchmaking, where precision engineering met sophisticated, understated design. This particular 5139-7020 model is a rare find for the discerning collector, featuring the upgraded 27-jewel automatic movement—a significant step up from the standard workhorse calibers of the time. With its sunburst silver dial and sharp, angular stainless steel case, this timepiece captures the "Grammar of Design" ethos that defined the late 1960s. Whether you are a vintage purist or a first-time collector, this DX stands as a testament to Seiko's enduring legacy of durability and style. Condition & Authenticity This Seiko 5 DX is in excellent vintage condition, showing honest character lines that reflect its nearly 60-year history. The case retains its original sharp factory chamfers, and the sunburst dial remains remarkably clean with all original applied markers intact. Verified Authenticity: The case back features the clearly visible Seiko Suwa logo, reference number 5139-7020, and serial number 880915, confirming its production date to August 1968. Movement: The 27-jewel automatic movement is a high-spec variant for the DX line, known for its reliability and smooth sweeping seconds hand. The Collector's Note The "DX" designation was Seiko's way of signaling a "Deluxe" version of their iconic Seiko 5. Finding these with the original bracelet and the higher jewel count makes this specific reference a "must-have" for those who appreciate the intersection of 1960s minimalism and mechanical excellence. Invest in a piece of horological history. This Seiko 5 DX is ready to be worn, admired, and passed down to the next generation.