Onsa watch, vintage 1960s, hand-wound mechanical, reference 10109, 18 kt/750 yellow gold case, weight: 10-11 g, textured bezel, extra-flat case with concealed lugs, Onsa branded winding crown, very fine and elegant watch to wear with a dress, diameter: 34-35 mm, Onsa branded movement, in working order and keeps time, case back hallmarked 18 kt/750, fabric-type dial, original genuine leather strap, Onsa branded, complete movement, in excellent condition, like new, near-NOS condition, strap length: 11.8 x 8.5 cm, shipping via courier with tracking, contact me for any further information.