Gatsby Jewellery Ltd has dated this piece to the 1960s.

Pieces from Cartier London are scarce and therefore highly collectable.
Every component of these cufflinks is hallmarked; each of the four faces, the linking posts, and the toggles that connect everything together, with two of the faces signed JC, and the other two signed 'Cartier'. A serial number (faint) is below the hallmarks.
Dated: 1960.
Measurements: Each face is 14.25 x 18.8mm.
Weight: 20.10 grams.
Metal: 18k gold. Fully hallmarked.
Item # 113113S310
Gatsby Jewellery Ltd has dated this piece to the 1960s.
Gatsby jewellery are a husband and wife team who have years of knowledge and experience in dealing in fine antique jewellery.
You can view the stock and full dealer information on the Gatsby Jewellery Ltd Profile Page