Perpetual calendar

Perpetual calendar with a desk pen holder, 1960s-1970s design, France.
Rare double-function desk accessory: perpetual calendar integrated with a pen holder, in a single design object. Oval base in matte black plastic, upper surface in gold-toned metal with four independent windows for month, day of the week, and date (texts in abbreviated French: OCT, LUN), adjustable via knurled knobs. In the center, tubular black metal pen holder with brass fittings.
Functional and elegant design, likely French or Francophone production, 1960s-70s.
Fully functional.
Dimensions: 14 x 9 x 8 cm.
Unbranded. An unusual item, ideal for vintage desk accessory collectors.