PATEK PHILIPPE, REF. 3448J, A RARE GOLD AUTOMATIC PERPETUAL CALENDAR WRISTWATCH

Launched in 1962, the reference 3448 was the first automatic perpetual calendar wristwatch serially produced by any manufacturer. It was made primarily in yellow gold in low numbers: estimates put the total production, all case metals, at approximately 600 units. A minority were cased in white gold (approximately 150 pieces), and one example in pink gold and two in platinum (with cases originally born in yellow gold).