IWC. A very fine and rare platinum limited edition split seconds chronograph wristwatch with guarantee and box

IWC. A very fine and rare platinum limited edition split seconds chronograph wristwatch with guarantee and box
Signed IWC Schaffhausen, Chronograph Rattrapante, Portugieser model, No. 173/250, Ref. 3712, case no. 2'797'078, circa 2001
Cal. 76240 mechanical movement, 27 jewels, white dial, applied Arabic numerals, two sunken subsidiary dials for constant seconds and 30 minutes register, large circular case, downturned lugs, back secured by four screws, split seconds chronograph mechanism operated through three round buttons in the band, platinum IWC buckle, case, dial and movement signed
41 mm. diam.