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Just going by eBay completed auction prices. Two last Gong straights sold were $34.44 for a 11/16 and $9.92 for what looks to be a 5/8...

A full hollow feels quite different from a wedge grind, and can be a bit more difficult to use, a wedge is more forgiving to your angle and may feel easier to use. Hollow gives better feedback,...

Now if it was a regular 6/8, the price would definitely be too much, I'd expect a 6/8 to be at least 50% less, but 7/8 is big boys stuff, and $80 doesn't seem that bad at all, and worldwide shipping...

He is asking more than anyone is willing to pay apparently.It's a 7/8.
But this thread might help it sell :)