IWC MARK XI rare gents wristwatch for the South African Air Force S.A.A.F., Switzerland around 1961, manual winding, screwed down steel case with soft iron-inner case, case back with military-engraving, black dial with white Arabic numerals, luminous indexes & luminous hands, rhodium plated movement calibre 89 with fausses cotes decoration, stop-second, diameter approx. 36 mm, condition 2-3, property of a collector