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The Seiko Prospex Speedtimer SRQ055 is a mechanical chronograph that revives Seiko's early-1970s Speedtimer racing design. Its caliber 8R48 automatic movement uses a column wheel and vertical clutch, which gives a smooth chronograph start and lets the watch keep running the chronograph without draining the power reserve. It measures up to 12 hours in 1/8-second steps, runs about 45 hours on a full wind, and can be wound by hand. The black dial carries a tachymeter scale, contrasting subdials, a date window and LumiBrite hands and markers. Against quartz Speedtimers it is heavier and needs servicing, but it competes with mechanical chronographs from Swiss brands on movement specification rather than on badge. It suits buyers who want a racing-styled automatic chronograph with real timing hardware.
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The Seiko Prospex Speedtimer Mechanical Chronograph SRQ055 is a men's automatic chronograph based on Seiko's Speedtimer chronographs of the early 1970s. It has a black dial with the word "Speedtimer," a black tachymeter bezel, subdials with a contrasting finish, and a date calendar. The hands and markers use LumiBrite for visibility in low light.
Inside is Seiko's caliber 8R48, a 34-jewel automatic movement that can also be wound by hand. It beats at 28,800 vibrations per hour and has a power reserve of approximately 45 hours. The chronograph measures up to 12 hours of elapsed time in 1/8-second increments. A column wheel and vertical clutch keep the chronograph hand moving smoothly and help maintain the power reserve during chronograph use. A three-pointed hammer system returns all hands to zero together when the reset pusher is pressed.
The case and bracelet are stainless steel with a super-hard coating for scratch resistance. The bracelet has multiple rows of links and a tri-fold push button release clasp. The watch has a dual curved sapphire crystal and a screwdown caseback, and it is water resistant to 100 meters.
