"Well, an arguable point. The ships of the W-1 and W-5 classes, 13 to 15 feet (4 to 4.6 meters) longer than those of the W-7 class, and with two stacks (funnels) to the single one of the W-7s, appear more destroyer-like to mine eyes."
Agreed, I wasn't clear. I meant in comparison with the W15-18 boats, as I had already written off the earlier types. But W5 might be a candidate indeed.
Re your final remark it would be good to check the Manila minutes and deliberations of this case, but that's out of my scope.