Patek Philippe yellow gold perpetual chronograph, made and sold in 1989. This example is from the second series ref. 3970s that feature rectangular baton numbers and feuille (leaf) hands. This series was made with solid backs and rarely supplied with a second display back. It’s hard to imagine that a ref. 2499 that left the factory in 1986 is worth well over 500,000 USD and the ref. 3970 is so reasonable in price by comparison. What a difference three years makes! Let’s see what the future holds for ref. 3970s but, in my opinion, in looks very bright.