This Tudor Oysterdate Chronograph ref. 79180, known among collectors as the iconic “Big Block,” is a remarkable vintage chronograph produced by Tudor by Rolex. Preserved in mint condition and accompanied by its full set, this reference features a robust 40 mm stainless steel Oyster case with screw-down pushers and crown, ensuring the sporty character that made the model legendary. The elegant silver dial is enhanced by contrasting chronograph subdials, applied hour markers, and the classic Oysterdate display at 3 o’clock. Powered by the automatic Valjoux 7750 chronograph movement, the “Big Block” earned its nickname thanks to the thicker case required to house the self-winding caliber. Combining Rolex-manufactured case elements with Tudor’s racing heritage, the ref. 79180 is today one of the most collectible vintage Tudor chronographs.