Blaster Nakoruru! Never used never published design. Hand painted, I think its paint.
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Looks like someone was a fan of Dororo. I own all 3 volumes so this stood out immediately.
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I came in here and was like:
This is pretty awesome. I am amazed someone would sell this.
The guy just didn't know what it was. Just a rusty folder with a flyer or two in it and some copied art. If he looked close enough he would have found the original sketches and documentation. They were all piled together in maybe 10 or so document sleeves inside the folder. None of his other auctions were anything related, just junk.