The Seiko Presage Sharp Edged Series is a new design series that revealed a fresh and powerful expression of Japanese artistry. This series captured the simplicity and refinement of traditional Japanese aesthetics in its delicately textured dial and gave it a modern edge with its sharp and angular case construction.
Engraved on the dials is the Asanoha, or hemp leaf, pattern that has been used in Japanese fabrics ever since the Heian period over a thousand years ago which has always been seen in Japan as a symbol of health and vitality thanks to its robust and fast-growing nature.
Measuring at 40.22mm in diameter and 12.2mm in thickness. The SPB305 and SPB307 use the new case style with an extra polished bevel between the top of the lugs and the case band. They house the Seiko’s caliber 6R21 movement that ticks at 28,800 beats per hour and have a power reserve of up to 45 hours. Both watches prominently show the day and date indicators as well as the power reserve indicator on the dial.
Measuring at 40.2mm in diameter and 11.8mm in thickness, slimmer than the first two. The SPB309 and SPB311 houses the caliber 6R38 movement that ticks at 21,600 vibrations per hour and have a power reserve of up to 70 hours. These two watches have an aperture at 9 o’clock showing the oscillating balance wheel as well as the moving escapement. Just like the Seiko Presage Sharp Edged Series SPB305 and SPB307, these open-heart versions share the same case design and diameter. All watches have a water resistance of up to 100m and has a three-fold clasp buckle.
Each of the four dials is in a different traditional Japanese color. Shironeri, the white of unbleached silk (SPB309) and Aisumi, the blue of indigo (SPB311) are used in the open-heart watches. Geppaku, the white of the full moon (SPB305) and Kurotobi, the color of the black kite (SPB307) are used in the two multi-hand creations.