I agree with the premise that it provides reference points on many guns. Once you enter the realm of esoteric guns, the market takes over and anyone shopping in a specialized market needs to monitor current trends. Example: Post DDR Merkel 8. Bluebook $1150 for 100%. Try $1800-$2000 especially in 16 or 20 when they can be found. The auctions, even the auction sites give a pretty good idea of what things are worth and what people want and if you don't pay attantion mistakes can be made. The Blue Book is a help on features of guns or manufacturers I'm not familiar with. Example: Some Bernardelli's are sideplated boxlocks that mimic sidelocks very well and can be misrepresented as sidelocks. The book helps identify points like this pretty well. A generic overview, but it is my rule of thumb.
