I did not understand what they were saying about the smallest watch in the world.
Here is what I have.
Next come three consecutive pages from by Sheila Young.
Pic A.
Pic B - last caption above
Pic C
The text (from Pic A) continues --
" France. The Princess wore it daily for seventeen years until, after her accession, she lost it at Sandringham and the most careful searches could not unearth it. In April 1957 she herself paid a State Visit to France and French statesmen, having heard of her loss, presented her with a replica, which she wore next day at a reception she held in the British Embassy. "