No, sorry, not a Finnish Puukko. I have lots of them, about 300 vintage and a few modern ones, and they never have one flat side. Hankala's Lastu puukko is diamond cross section. The proper Japanese term for blades flat on one side - katakiri-ha if I recall correctly.
Rich S
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Richard Stein, PhD
Old Puukkophile
NKCA Life Member
Japanese Sword Guide
http://home.earthlink.net/~steinrl/nihonto.htm