Well Ive had this  kukri for a couple of years but etched it lightly this afternoon, {boiling vinigar.} & although I have a couple of laminated kukri, one  in Tibetan hairpin style & also a coursly layered folded one, which are quite obvious,  but to me  this one seems a tottaly different type of metal or pattern, much finer. 
what is it?  Opinions & views needed! 
Thankyou.
Spiral
max.blade dia. in above pic. 55mm
&  thinner below.