This amazing Rolex Bubble Back ref. 3133 in steel and pink gold, dating to the 1940s. This iconic Oyster Perpetual features an original silver-toned dial with elegant patina, perfectly complementing the warm two-tone case. The watch is powered by a self-winding automatic movement, typical of early Rolex “Perpetual” calibers, housed in the distinctive bubble caseback designed to accommodate the rotor. The case measures approximately 31–32mm, consistent with classic Bubble Back proportions. Fitted with a proper two-tone bracelet, this piece embodies the timeless charm and historical significance of early Rolex production, combining technical innovation with refined vintage aesthetics.