IWC REF. 378507 INGENIEUR
CHRONOGRAPH SILBERPFEIL STEEL
International Watch Co., Schaffhausen, "Ingenieur
Chronograph Silberpfeil," case No. 5186922, Ref. IW378507. Made circa 2012.
Very fine, large, tonneau-shaped, self-winding,
water-resistant, stainless steel wristwatch with
square button chronograph, registers, tachymeter,
date and a stainless steel IWC buckle. Accompanied
by the fitted box and blank warranty card.
Dial, case and movement signed.
Three-body, polished and brushed, bezel with tachometer scale to 1000 UPH, screwed-down case back with engraved image of Silberpfeil, (a race car), sapphire crystal.
Bicolor brown (oeil-de-perdrix decoration) and silver with applied steel luminous baton indexes, outer minute and seconds divisions with Arabic five-minute markers, subsidiary seconds and combined 60-minute and 12-hour register dial, date aperture at 6. Stainless steel luminous baton hands.
Cal. 89361, rhodium-plated, 38 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring, double-pawl automatic winding system, hack mechanism.