Reference 570 was Patek Philippe's very first "large" Calatrava model that was produced in series. At the time of production, the reference was the largest time-only wristwatch produced by the firm. Manufactured from 1938 to 1972, the model was cased predominantly in yellow gold, and rarely in pink gold, white gold, stainless steel and platinum. The reference featured a multitude of dial variations. While some were fitted with Breguet numerals, others were two-tone in design.

Cased in stainless steel, this reference 570 is truly astonishing. It exhibits full, thick lugs, and incredible proportions. The flat, cylindrical bezel retains sharp definition. The contrasting brushed and satin finishes enable the beholder to easily imagine how the watch originally left the Patek Philippe workshops.

It most notably displays the signature of Hausmann & Co above the subsidiary register at 6 o'clock. To date, only three examples of stainless steel reference 570s with this particular signature have appeared on the market, making the present example incredibly rare. The dial itself is preserved in beautiful condition, with barely any signs of aging. Furthermore, the hard enamel graphics remain raised and crisp, attesting to the originality of the timepiece.