One of a sequence YC-700 - YC-728 built by Dravo, all identical.
Delaware also lists a 95' barge at this location; I think that is an error.
Masks come in hundreds of models and designs. Options include one to six windows, purge valves, color tinting, anti-fog coatings, and whatever else the corporate marketing guys can think up.
A mask's purpose is to let you see in the water. It is surprising just how narrow your field of view in a mask actually is, although you get used to it. Generally, the closer the main windows are to your eyes, the wider your field of view, and this is good. Side windows are supposed to increase your field of view, but they also move the main windows away from your face, and at any rate, you can easily turn your head to get the same effect. A few masks also have bottom windows, which are useful for inspecting yourself or your gauges.
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