Tank Cintrée — Cartier London · Blue Numerals

London occasionally printed numerals in red and, much more rarely, blue. A 1969–70 example (20.5 × 42.5 mm) has blue radial Roman numerals, a 6¼-ligne oval Jaeger-LeCoultre movementMovementThe working mechanism inside a watch or clock. and pointed baton handsBaton handsNarrow, stick-shaped hands. Baton describes the outline rather than whether the hands contain luminous material or were fitted when a watch was first made..