There is a lot of information available about these coins. Condition will greatly affect value. It may benefit you to investigate having the coin profesionally graded and "slabbed" by one of the grading services (PGCS, etc.) prior to sale. I can't comment with any knowledge about dealers. Stacks has been around for a long time. Here's a list of sales from a 2003 reference. Good luck.


http://www.coinfacts.com/double_eagles/saint_gaudens_double_eagles/1907_high_relief_knife_rim.htm