Patek Philippe & Co. Platinum Open-face Watch

Description:

Patek Philippe & Co. Platinum Open-face Watch, silvered dial with applied arabic numerals and dot minute track, sunk seconds and Breguet-style hands, Cotes de Geneve 18-jewel, stem-wind, stem-set movement marked "Eighteen (18) Jewels/Eight Adjustments/Patek Philippe & Co. Geneva, Switzerland," snap-back case 25039, dia. 44 mm, 55g.
Estimate $800-1,200

setting, winding, but does not stay running, case back appears to have ben altered.