At the Cartier Exhibition in Canberra last year, one of the exhibits was this Cartier clock, a gift from Queen Alexandra to George V for his coronation.



According to the Exhibition notes, the clock was a stock item and purchased shortly before the coronation.

Queen Alexandra spent a couple of days in London just prior to the coronation so perhaps she purchased it then before retreating to Sandringham with her sister and Princess Victoria.

See the Royal Collection site for some better images
https://www.rct.uk/collection/2894/desk-clock-0