This is the Wraith, the play set from the Pirates of Dark Water Cartoon from 1991.
I've owned this (I bought 2 but opened mine) since the mid-1990's. It was never opened on purpose, but the glue got tired and it opened anyway.
In lieu of that, I opened it up all the way and took photos of the insides, so you can see that they're mint. It includes all of the parts, the directions, the sail, and small bits.
It's been in storage the whole time, and I need the space here in the studio!