The IWC Schaffhausen Da Vinci Perpetual Calendar (Ref. IW3750) is a landmark timepiece in modern horology, best known for its revolutionary perpetual calendar module developed by master watchmaker Kurt Klaus. This 39mm automatic chronograph is highly regarded for its technical ingenuity and distinctive baroque-inspired design.

• Case: 39mm diameter with a height of approximately 14.3mm. It is characterized by its double-stepped case design and iconic articulated (hinged) lugs that ensure a comfortable fit on various wrist sizes.

• Dial: The black dial configuration features a highly legible layout with four sunken subdials.

  • Functions: Hours, minutes, small seconds, chronograph, and a perpetual calendar (day, date, month, four-digit year, and moon phase).

  • Moon Phase: Positioned at 12 o'clock, integrated into the 30-minute chronograph counter.

• Movement: Powered by the IWC Caliber 79261 (based on the Valjoux 7750), featuring Kurt Klaus’s module that allows all calendar indications to be synchronized and adjusted solely via the crown.

• Crystal: Traditionally fitted with a domed acrylic (Plexiglass) crystal, though sapphire was available as an option on later or specific models.

• Historical Significance: Launched in 1985, this model was instrumental in revitalizing interest in mechanical complications during the post-quartz crisis era.