User blog comment:JustSomeDude.../The Ships in the Harbor/@comment-5640399-20131217165652

It's not identical, but it does strongly resemble the ship of one of WBs affiliated crews. It's smaller, so possibly it's not the flagship of that crew, but they could have affiliated themselves with DD since the war, or possibly they were always DD's allies and he had moles in the Yonkou as well as the marines.