Seiko Seikomatic Weekdater 天耀 408980 (1963)

Offered in this auction by Second Vintage This is a remarkable example of the Seiko Seikomatic Weekdater, a significant model from the early 1960s that bridged the gap between everyday reliability and high-end luxury. With its impressive 33-jewel movement and the distinctive "Weekdater" layout featuring the full day display at the six o'clock position, this timepiece represents the golden era of Japanese watchmaking. The reference 408980 is particularly sought after for its balanced 37mm case and the charming "Water 30 Proof" dial text, a detail found only on these earlier vintage examples. Brand: Seiko Model: Seikomatic Weekdater Reference Number: 408980 Serial Number: 3D01034 Movement: Automatic Caliber 400 Seikosha Dial: Silver sunburst with applied gold indices Case Size: 37 mm (excluding the crown) Case Material: Gold Plated (SGP) Production Year: 1963 Condition: Good vintage condition, showing honest wear to the gold plating consistent with its age, while the dial remains beautifully preserved. Dial and Hands The silver sunburst dial is the highlight of this timepiece, preserved in very attractive condition with a warm, gentle patina that enhances its vintage character. It features the signature Seikomatic script and the desirable "Water 30 Proof" text above the six o'clock position. The layout is iconic, with a framed date window at three o'clock and the full "Saturday/Sunday" style day window at six o'clock. The faceted gold-tone hour markers and sharp dauphine hands catch the light beautifully, providing excellent legibility and a sophisticated aesthetic. Case and Crystal The 37mm gold-plated case features the elegant twisted lug design that defines this era of Seiko dress watches. The case is stamped SGP and shows clear signs of vintage history, with visible wear and brassing to the plating on the high points of the lugs and edges, adding to the honest character of the watch. The crown is recessed at the four o'clock position, a design choice intended to emphasize the efficiency of the automatic winding system, as manual winding was deemed unnecessary. The acrylic crystal is clear and presents well. Movement Powering this watch is the highly regarded 33-jewel Seikosha automatic movement, a high-count jewel caliber that signifies the upper-tier quality of the Seikomatic line. The movement features the efficient Magic Lever winding system. Timegrapher testing shows the watch is running at +10 to +13 seconds per day, which indicates a healthy movement offering reliable vintage performance. Strap The watch is fitted with a new black leather strap featuring contrasting gold stitching that perfectly complements the gold tones of the case and indices. Condition This timepiece is in good vintage condition. While the case shows evident wear and softening of the gold plating typical for a watch of this vintage, the structural integrity remains sound. The dial is in excellent condition, crisp and legible, making this a very wearable and attractive piece for the collector who appreciates original character. Dimensions The case measures 37 mm in diameter excluding the hidden crown, a size that offers a contemporary presence on the wrist while maintaining classic proportions. Remarks The Seikomatic Weekdater is a cornerstone of any serious Seiko collection. This specific example, dating to December 1963, captures the elegance of mid-century Japanese design. Its combination of the high-jewel count movement and the specific "30 Proof" dial text makes it a historically interesting piece that wears its history openly. History Introduced in the early 1960s, the Seikomatic line was Seiko's automatic luxury tier, serving as the foundation for what would eventually evolve into the first automatic Grand Seiko models. The 33-jewel variant was a premium offering, designed to compete with high-end Swiss automatics of the time. These watches were marketed to the rising business class in Japan, symbolizing the nation's post-war economic recovery and technological advancement. / Second Vintage SKU: SEI-SMW-0009