A very good fiend of mine's father recently passed and he has come into possetion of a Geyger 8x57 double rifle. A hand written note with the rifle indicates it's pre war about 1934. I know absolutely nothing about double rifles, but it appears to my eye, to be in very good condition and well cared for (clean, oiled etc...). Where could I find a reputable opinion of value for this rifle?

By the way, this is a great forum from what I've explored so far. Thanks.