Dtm, I've spent a fair amount of time over the past 20+ years developing a set of charts that show Brit and Continental gun values (not to be confused with prices) as functions of Brand Value (BV), Original Quality (OQ), and Current Condition (CC). Several of the guys here have and use said charts with a very good level of expertise. While not "gospel," the charts have over the years shown a good correlation to auction results (a public knowledge of gun prices). The value of the charts is to jump-start learning. They require some expertise to use, but seem to provide a good return in speeding up the learning necessary to evaluate Brit and Continental guns.

Post back if you have further questions.

DDA