The present watch bears "Dauphine" radiumed hands with movement number 1119008. We may presume that this watch is the 9th model of this series and that, at the beginning, the reference 3448 was created with radiumed hands, modified then to regular "Dauphine" hands.In the mid-1960's, manufactures started to replace radium coating of the hands and numerals of the watches with tritium coating. As a matter of fact, they had noticed that radiumed dials were slightly radioactive.Ref. 3448Produced in 586 examples from 1962-64 to 1982, with the calibre 27-460Q, the majority in yellow gold, rarely in pink or white gold. This series began with the serial number 1'119'000.A similar watch is published in Patek Philippe Wristwatches, by Martin Huber & Alan Banbery, 1998 Edition, p. 288.A unique example of this reference is known to date in platinum. Its movement was made in 1973, and, at the request of the owner, was cased in platinum by Patek Philippe, with sapphire indexes on the dial, and delivered on 9 January 1997. This watch was sold by Antiquorum, Geneva on April 18-19, 1998, for SFr. 201'500 (US$ 133,100).