"...been appraised at $500..." Recently? That's the best one I've seen in eons. A Martini in that condition will bring a lot more than $500. Epp's wants $829 for an 1882 in 'good' condition.
"...is about in 90% condition?..." According to who? No offense, but a firearm's condition is a relative thing. 90% would mean little wear on any part including the bore.