Even if it was a KO, that's a hell of a pickup for $40. Congrats!! I spend months picking up missing pieces for my G1 Menasor...I spent that much on weapons alone!
The color has held up awfully well, I would think that's a repro box if not a KO entirely, but for $40 it's still a get. I'm guessing the OP wants to flip this piece as he's an MOTU guy, and that's fine. What I'd suggest is offering it as-is, making no claims as to authenticity, and not shooting the moon for a G1 complete set's price. Let the market decide how much it's worth. You are under no obligation to determine its authenticity if you aren't supplying a COA or a guarantee of any kind, and you are under no moral obligation if you aren't making claims you can't back up about its authenticity, so don't claim it to be authentic and if you start an auction low and let the buyers decide the value, you'll be ok.
Hope this isn't too necro, but... I've seen a couple vintage Menasors on the bay without the red eyes. Are the eyes stickers?...or is this just funky business? Thanks. Couldn't find that difference on the wiki, but the image searches bring up a lot of red-eyed Menasors.
