WATCHES arranged by most recent to earliest worn from its FIRST appearance starting Engagement Day.

BALLON BLEU DE CARTIER WATCH

Feb 14, 2014 The ICAP Art Room Opening: http://www.zimbio.com/photos/Kate+Middleton/Duchess+Cambridge+Attends+ICAP+Art+Room+Opening/QGA1canCkku

She is wearing 33mm size: http://www.cartier.us/collections/timepieces/womens-watches/ballon-bleu-de-cartier/w6920084-ballon-bleu-de-cartier-watch-33-mm

April 21, 2014: After reviewing photos from Cartier and comparing with Kate's, the Duchess is wearing the 33mm size, which is a new size introduced in 2013.  The normal medium size is 36mm and also has a straight edge on its first H-link similar to the smallest 28mm size.

TISSOT TWO-TONE WATCH

Kate wore this watch during her dating years with Prince William.

March 3, 2013 Switzerland: http://www.zimbio.com/photos/Kate+Middleton/British+Royals+Hit+the+Slopes/sUFODRHcqz2

For a better close-up of this two-tone watch, please check My small obsessions facebook page: https://www.facebook.com/photo.php?fbid=557408794347990&set=a.286721141416758.71520.132426196846254&type=2