1930s Longines "Tre-Tacche" Water-resistant Rare Silver two-tone sector dial

This is a highly rare Longines "Tre-tacche" 30mm waterproof model from the late 1930s, featuring a sought-after silver 3 baka-sector dial. The step design and three-point screw-back waterproof case, which are the origin of the "Tre-tacche" name, have a substantial feel unique to Longines despite the small 30mm size. The two-tone sector dial, known as "3 Baka", displays a nostalgic charm and excellent style from that era. It is equipped with the in-house movement Cal. 10L. The combination of the substantial 30mm screw-back waterproof case and the two-tone sector dial creates a compact and highly refined aesthetic.