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which is especially well-known for this model
patented a system in the 1960s to literally evacuate the air from the watch case
Flipping the watch over reveals the iconic Hippocampus (Sea Monster) medallion embossed on the stainless steel caseback
Brand Seiko Model Seiko Tank REFERENCE/SKU 7830 - 5040 /H1072 YEAR 1980's MATERIAL Stainless-Steel WINDING Quartz CALIBER 7830 SERIAL -- CASE DIAMETER 31x28mm CASE THICKNESS 6mm BETWEEN LUGS 18mm SERVICE Serviced STRAP Leather Strap
Seiko - Duo-Display (Ana-Digi) Quartz - H601-507A JDM which is especially well-known forThis timepiece is a magnificent artifact from the Japanese Domestic Market (JDM), representing the tactical evolution of Seiko's hybrid display technology during the late 1980s. The Seiko Duo Display, reference H601 507A, is defined by its rugged, architectural octagon inspired case and a matte black dial that perfectly balances traditional analog hands with a digital LCD window at the 6 o'clock position. It is powered by the high grade Seiko Caliber
