This is a Longines cal 10.39 in the original sterling silver wire lug cushion case with matching serial numbers on the caseback and movement. This is running and keeping good time but does hesitate or stop occasionally when moved around. The case measures 24-25mm across without the crown and the lugs are approx 14-15mm. As shown the case and crystal show scratches and scuffs from age but if cleaned up this would look much nicer.