The cushion-shaped case—nicknamed the “Turtle”—is known for its rugged construction and comfortable fit, making it a highly functional and wearable design. The dial features a distinctive combination of dot indexes, pencil hands, and an arrow-shaped hour hand. The seconds hand is accented with a playful round detail known as the “lollipop,” adding character to the overall aesthetic. The watch is equipped with a bilingual day-date display in English and Spanish. The bidirectional rotating bezel features a dual-knurl edge, enhancing grip and ease of operation.
The case remains in excellent condition, with minimal signs of wear or impact. While the bezel shows some minor marks, it retains its deep black tone without noticeable fading. The crystal has a few hairline scratches, though they do not affect legibility. The dial is clean and free from discoloration, preserving a fresh and well-kept appearance. The hands show slight patina, but still maintain their original shine. The luminous material on both the hands and indexes has aged evenly into a warm beige, contributing to its vintage charm. The watch has been disassembled and cleaned by our team.
Reference 6309-7040 is a diver’s model produced for markets outside Japan. The inclusion of Spanish day display indicates it was intended for Spanish-speaking regions. This model was favored not only by divers but also by military personnel and special forces units. A quintessential example of Seiko’s technical prowess and design innovation in the 1970s, this piece offers both functionality and character in equal measure.
















