From left to right
1) Oyster Bracelet: 3 piece link configuration. The pieces are flat. Produced after the jubilee bracelet.
2)President Bracelet: 3 piece link configuration. Pieces are curved, which gives a round look. Produced after the Osyter and Jubilee Bracelet.
3)Jubilee Bracelet: 5 piece link configuration, three small pieces in the center with two large pieces at the side. Produced before the Osyter and President Bracelet.