Unusual and very rare oversize case single button chronograph produced for the "Regia Aeronautica Italiana". Snap on back case, milled revolving bezel and triangle at 12 o'clock. Case n° 1176159, diam. 37 mm. Original black dial with white graphics, white enamel indexes with outer telemeter scale and tachimeter in the center. Stainless steel baton hands. Hand winding movement by Lemania cal. 15TL.