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The pre-release page shows generic 1st and 3rd rates as well as HMS Victory and L’Orient. I would like to see some ship sprees to see how much diversity you can have in things like figureheads.
The new Firelock Games Oak & Iron also looks interesting, and uses 1:600 scale ships. I see those rules are available fro free download, too.
I'm quite tempted by one of these but I'm holding fire until I see some reviews of both. I'm leaning towards Oak and Iron because Blood and Plunder is such a brilliantly put together product.