Vacheron Constantin 4072 chronograph, 40s 18k gold round case, n.302540, rectangular pushers. Argenté dial, applied indexes and roman numerals. Hand-winding movement, cal.Y492, n.466420. Leather strap. Size: 35 mm. Notes: Reference 4072 was in production from 1938 until the late 60s, and is one of the most iconic and sought after vintage chronograph made by Vacheron Constantin. It is a very diverse model, cased most often in yellow gold and rarely in pink gold, stainless steel, or steel and gold.