Lin,
As you are probably aware each guns value ultimately rests on its own merits. I know of three Holland sidelock 12 bore Paradox guns which have sold in the past 14 months. One a grade 2 with border engraving sold for about 10K. A 2 1/2 chambered Paradox with some cc and a case sold for 17k. A magnum Paradox cased with an extra set of shotgun barrels sold for 28K.
I am assuming your gun was made after 1900 and has the Fosbery rifled chokes. It's value would be somewhat less than a Holland.
Internal measurements(bore .735 and choke .690 for a 12) are very important in determining a rifled choke guns ultimate value.
Last edited by PM; 12/16/08 03:25 PM.