Hello Joe,
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yes it is concave convex, I believe I mentioned that, and tried desperately to photo it, these photos should help.
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I'm not sure these pics really help...
You realise that we're speaking of the cross-section of the blade? (There shouldn't be any bend along the long blade axis.)
BTW, the final curvature of the blade (back) depends obviously not only on the quenching but also on the initial configuration. A good blade smith takes this into account to obtain the intended final shape. Many mandau have a pretty straight edge while there are also quite a few with fairly curved blades.
Regards,
Kai