There are MANY, MANY variations in the Harpy/Merlin (C08) line.
Too many for me to ever consider trying to collect, although I do have a FRN SE Gin2 Merlin (aka Harpy) made around 1993-1994. which was one of the 1st Spydercos that I ever purchased.
There's no reason question that the OP's Harpy is authentic, especially since it comes w/an apparently genuine box and "literature" for the period, which is something cloners always seem to fail to replicate accurately. I also don't think there's much $ in it for cloners to bother faking a Harpy/Merlin.
Nothing said in SpydieWikie about buffed versus unbuffered (or liner versus linerless) G10 models that were made around 1997-1999 per SpydieWiki.
See:
http://www.spydiewiki.com/index.php?title=C08_Harpy.
There are a lot of linerless G10 Spydercos, especially those that are backlocked (like the Harpy/Merlin) which do not require a liner to begin with.