Heuer, Autavia GMT, Ref. 2446C, a stainless steel wrist watch, circa 1970, manual wind chronograph movement, 17 jewels, cal. 724, black dial, luminous baton markers, luminous pointed baton hands, centre red chronograph hand, centre red and luminous arrow dual time zone hand, subsidiary dials for constant seconds, 30 minute and 12 hour recording, two tone rotating bezel with Arabic numeral 24 hour index, snap case back, on a non-original brown leather strap with stainless steel pin buckle, case back, dial, movement and crown signed, diameter 41mm Produced alongside the time-only 2446C, this watch focusses on the Aviation part of the name ‘Autavia’ adding the extra utility of a second time zone indication. This Mk3 dial variant combines red seconds and GMT hands with red hash marks for the hours while the main hands remain polished steel. The case is beefed up with heavier lugs and a compressor-style case back.