1930s Universal Watch very rare "Colonial" Water-resistant with Black sector dial

A highly rare "Colonial" 1st waterproof model with a black sector dial, manufactured by Universal Watch in the 1930s. This was Universal's first screw-back waterproof model and is likely the world's first chronograph with a waterproof function. Its uniquely designed case shape and construction exhibit unparalleled originality, while the beautifully crafted sector dial with white lettering reflects the distinctive aesthetic of its era. A truly valuable timepiece that embodies the essence of its time.