International Watch Company (IWC), founded in 1868 by Florentine Ariosto Jones in Schaffhausen, merged American industrial methods with Swiss craftsmanship to produce highly precise, durable watches. It became a leader in functional tool watches—most notably pioneering pilot’s watches and the “Big Pilot”—while advancing materials like titanium and ceramic, with innovations like the Pellaton winding system reinforcing its reputation for technical, engineering-driven watchmaking.

The ref. 521 is often referred to by collectors as the "Shark Fin" due to its distinctively shaped lugs. At 37mm, it is considered a jumbo size for its time, offering bold wrist presence. It houses the well-regarded cal. 89, known for its high quality finishing and reliability. This particular example is housed in 18k pink gold and has remained in absolutely stunning vintage condition. The case appears completely untouched with sharp edges and crisp hallmarks. The dial/hands are equally impressive and with many examples being refinished from this era, this piece stands out as a true survivor. The dial is virtually mint with no notable wear and tight pearling. For anyone looking for a top example, this piece is an opportunity that surely does not come up often.