Steel can get overheated during the final grind, that would be my guess.
Thanks everyone for the replies.
All great suggestions, I'll think this over - yes you're right it's only the one knife without a saya (for now
The knife is sold pending funds.
If your friend's brother can't be talked out of a ceramic knife, Miyako is another brand that seems to be highly regarded. See, e.g., http://www.myceramicknives.com/ceram...-knives-review
Ok to answer your question... 3.1kg.