I am more and more finding the Blue Book of Gun Values price guides to be meaningless. Everyone seems to be proud to own things that are less than great, and want top dollar. Anyway, I found a 1973 Single Six, 9 1/2" barrel, missing the original grips, and about, according to the Blue Book, 60%- 70%, at best. Needs a new hammer, as I suspect the "click" is broken off. No extra cylinder, box, etc. $600 firm, because its old. Any thoughts/advice? Thanks.