PATEK PHILIPPE REF. 3509 STEEL
Patek Philippe, Genève, Ref. 3509. Made in 1966.
Fine and unusual, thin, water-resistant,
stainless steel wristwatch.
Three-body, polished, inclined bezel, screwed-
down case back, straight lugs.
Textured silver with applied white gold baton
indexes. White gold baton hands.
Cal. 23-300, stamped twice with the Seal of
Geneva quality mark, rhodium plated, fausses cotes
decoration, 18 jewels, straight-line lever escapement,
Gyromax balance adjusted for heat, cold, isochronism
and 5 positions, shock absorber, self-compensating
Breguet balance spring.