Seiko 4s15-6010, l'Alpinist in borghese

Caliber: Seiko Cal. 4S15, 25 jewels, 28’800 A/h, integrated auto-winding, micro-regulator, Diafix shock absorption, thermo-compensating balance and hairspring, auxiliary manual-winding, hacking
CASE: Stainless steel, screw case back, screw-down crown
CRYSTAL: Sapphlex*, flat profile with date window magnification
WATER RESISTANCE: 20 Bar / 200 m
MANUFACTURED: In Japan, 1995-1997
Prezzo (1995): 35,000 JPY

Il movimento di base della serie 4S è il 4S15, 25 rubini, automatico con secondi centrali e datario.
Funziona a 28.800 VPH, ha una finitura spazzolata piatta tranne che per il rotore, che è rifinito con colimaconnage, è nichelato, ed ha rubini sia nello scappamento che nella quarta ruota - finezza che risale ai Seiko cronometri degli anni sessante.
anche l'uso del colimaconnage è una tradizione Seiko, risalente ai Grand Seiko automatici degli anni 1960.
il 4S15 è essenzialmente una riedizione del calibro serie 52 degli anni settanta, originariamente utilizzato per la linea premium King Seiko, è probabilmente il movimento automatico di più alta qualità in questo range di prezzo (all'uscita tra 35.000 e 45.000 Yen).
il calibro 4S12 è una variante del 4S15 con un ulteriore lancetta delle 24 ore GMT.

First introduced in 1992, the 4S calibres make up the "bread and butter" of Seiko's mechanical movements. They are a diverse group of automatics and handwinds which are actually based on a single Seiko ebauche. It should be noted that all Seiko automatics above the 7S level can also be wound by hand.

The base movement of the 4S series is the 4S15 (shown above), a 25 jewel automatic with center seconds and date calendar. It runs at 28,800 vph, has a flat brushed finish except for the rotor which is finished with colimaconnage, is nickel-plated, and has cap jewels on both the escape and fourth wheels -- a nice touch which dates back to the early Seiko "Chronometers" which often featured cap jewels all the way to the center wheel. The use of colimaconnage is also a Seiko tradition that dates back to the Grand Seiko automatic movements of the 1960s. The 4S15 is essentially a reissue of their 52 series calibre from the 1970s, originally used in their premium King Seiko line. It is probably the highest quality simple automatic movement at this price point in the world (35,000 to 45,000 Yen). Calibre 4S12 is a variant of the 4S15 with an additional 24-hour GMT hand.

MOVEMENT: Seiko Cal. 4S15, 25 jewels, 28’800 A/h, integrated auto-winding, micro-regulator, Diafix shock absorption, thermo-compensating balance and hairspring, auxiliary manual-winding, hacking
CASE: Stainless steel (diameter: 38 mm excl. crown, thickness: 10 mm, lug-width: 19 mm), screw case back, screw-down crown
CRYSTAL: Sapphlex*, flat profile with date window magnification
WATER RESISTANCE: 20 Bar / 200 m
MANUFACTURED: In Japan, 1995-1997
MRSP (1995): 35,000 JPY (NZ$580)

*Sapphlex is a Seiko proprietary hardened mineral crystal, as with Hardlex. Sapphlex has a layer of sapphire crystal laminated on the outer side, to takes advantage of both the sapphire’s superior scratch resistance and Hardlex’s impact resistance properties.