The Smuggler's ship appears in the two-part TNG story 'Unifiation'. It's an unusual balck ship that can barely be made out in the darkness of space and is collecting parts from the Qualor II shipyards as part of a Romulan plot. The studio model was made by  heavily modifying the Husnock ship from 'The Survivors', adding wings and painting the resulting ship black. The model is 5.1" (13 cm) long.