Spunjer:
Hardened edges -- yes, very common.
Laminated blades -- I haven't etched enough Visayan blades to answer how commonly they may be laminated, but my impression is that laminated (pattern-welded) blades are much less common than blades of homogenous steel with an inserted or tempered hardened edge.
Zel probably has the best handle on this question.
Ian.
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