excuse me for my bad english.
The coloration was various between the several units and also in function of the year.
The used colors were: clear gray, medium gray and black according to various schemes of coloration.
See the link for examples:
http://www.larsenal.com/Source/catal...gia/RM_006.jpg
http://www.steelnavy.com/RMNewModelsOct2005.htm
Last thing, the "Navigatori" model of the game is completely mistaken.