Longines. An attractive and rare stainless steel flyback single button chronograph wristwatchSigned Longines, movement no. 5'457'408, case no. 5'457'408, circa 1937Cal. 13 ZN mechanical movement, black dial, luminous Arabic numerals, outer Arabic five minute divisions, two subsidiary dials for constant seconds and 30 minutes register, luminous steel baton hands, bi-directional revolving ribbed steel bezel with dagger marker, circular case, down turned lugs, snap on case back, rectangular chronograph button in the band, dial and movement signed, case numbered35.5 mm. diam.