Visual Description
The 887907 is a 26 mm round Cougar in 18k yellow gold, set with diamonds. Where the stones sit differs between the examples cataloged: Antiquorum describes a bezel set with 40 round diamonds, Monaco Legend a diamond-set bezel and lugs, and Bonhams Cornette de Saint Cyr a diamond-set crown on a case with a stepped bezel and eight decorative screws. Antiquorum gives a thickness of 6 mm.
Dials are silvered or blue. Bonhams Cornette de Saint Cyr describes a silvered dial with black Roman numerals, a date at 3 o'clock and blued steel sword hands; Monaco Legend a deep blue lacquered dial with diamond indexes; and Antiquorum a blue dial with applied yellow gold Roman numerals and yellow gold épée hands. Bukowskis gives a sapphire crystal.
Reference Significance
The 887907 is the gem-set version of the 26 mm gold Cougar. The plain ladies' model in 18k yellow gold is the Ref. 887906, and the 33 mm gold Cougar is the Ref. 887904. All three run on Cartier quartz movements.
Catalogs pair the number with other references. Bukowskis printed WF8001B9 as the reference of an example with case number 887907 / 002681, and Antiquorum printed Ref. 2462 beside case No. 887907.
Historical Context
Bukowskis and Bonhams Cornette de Saint Cyr date examples circa 1990, and Monaco Legend and Antiquorum date others to the 1990s. No source we opened gives a first or last year of production.
The movement is quartz and signed Cartier. Catalogs give three caliber numbers: Cal. 87 with 7 jewels, Cal. 87.06 and Cal. 690 with 8 jewels.
What to Look For
Read the case back for 887907 and a serial, such as the 002681 Bukowskis recorded. Bonhams Cornette de Saint Cyr found the hidden Cartier signature at 10 o'clock on its silvered dial. Check that every stone is present and matched, on the crown, the bezel and the lugs as the example requires.
Examples have been sold on an 18k gold brick-link bracelet with a signed double folding clasp, on an original bracelet with a folding clasp, and on a leather strap with an 18k gold Cartier buckle. Ask which one comes with the watch.

