This is what the seller wrote in the description:

eBay link

"HI THIS IS THE TRANSFORMER SPACESHIP THE ARC THE ARC MEASURES 21''X12'' IT HAS THE HASBRO

LOGO ON IT AND THE YEAR IS 1987 I HAVE NEVER SEEN THIS SHIP BEFORE I DONT KNOW MUCH ABOUT IT

LOOKS TO BE VERY RARE THE ITEM IS NOT NEW SO IT IS SOLD AS IS HAVE ANY QUESTIONS JUST LET ME KNOW THANKS"


Based on the description I thought I was getting a G1 Prototype Ark, but upon getting it, I realized it was a custom painted GI Joe Defiant(aka Crusader). It is a nice custom, however this seller loses points for honesty.

It's a good thing I like it, so I'm not too disappointed.

wow that sucks. yeah, if you'd asked earlier I coulda IDed it for yah, too bad you didn't get the rest of the parts, the deffiant playset is 00ber, only dwarfed by the USS Flagg

still,fecking cheap for a defiant.

yeah, but it's only one part. If I'm getting a Deffiant I want the space station and the crawler too.

You know, I really like this piece!! It works really nice with scf and wst!!

I wish I had a purple shuttle to repaint as the Decepticon spaceship, anyone know a fitting model?

Check out wut my boy did(I got to see him work on this project) wit his mini ark, & Custom Ark b/g's in his stop animation; "Instruments of Destruction:"

YouTube Video

That video is

Now do the whole movie!!


CJ

I agree, that was a very well done stop animation. The camera angles, the characters, perfect.