Omega Plongeur Professional Dials
It appears that there are historically three PloProf dials. They are most easily differentiated by the order and content of the lower dial text.
Type I - these dials appear very dark blue. They may be the reason for the rumoured black dial PloProf, due to inadequate lighting in photos.
Type III dial - this is the one most people will be familiar with. It has the depth rating in meters and feet. The blue of the dial seems mid-way between the Type I and Type II.
There are also appear to be three different bezels, at least two different handsets and two different case styles. For more information see the upcoming PloProf book.
Almost all Type I dials appear very matte, bubbled and dark blue - almost black. It is thought that Omega noted these paint problems on the Type I and this precipitated the change to the Type II dials. These dials use Tritium luminous material which is notorious for ageing poorly by disintegrating and being affected by mould.
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Type II Dial - The bluest of the PloProf dials the Type II is most recognisable in that the number 600 appears as the last line of text. Also the type of the word "Seamaster" is much heavier than that of the text "Professional" or "600".