In 2005, Omega added the Planet Ocean to the Seamaster line of dive watches. The new offering boasted double the water resistance of the original Seamaster Pro and a more robust design overall.
Omega offers 5 variations of the Planet Ocean model. For the purposes of this post, KeepTheTime is going to cover the top 3 most popular versions. The ladies 37.5mm and the chronograph have been left out, perhaps for another post.
In the photo above, we lined the models up according to size: biggest to smallest from left to right.
The Planet Ocean XL is the most popular PO model. The watch shown here is reference 188.8.131.52.01.001 and has a black ceramic bezel with silver markers. This watch is also available with an orange bezel with orange markers (184.108.40.206.01.002), or a black bezel with orange markers (220.127.116.11.01.003). You will notice that the only difference in the reference number between these configurations is the last digit.
As with the XL above, the smaller 42mm version is also available in 3 configurations: black bezel with silver markers (18.104.22.168.01.001), an orange bezel with orange markers (22.214.171.124.01.002), or as shown here with a black bezel with orange markers (126.96.36.199.01.003).