Lindner stuff is between Brand Value level BV2 and BV3, say BV2 1/2. This gun looks to be Original Quality grade OQ1. Current Condition would be CC9 (unshootable without major repairs or wall hanger).

BV2.5 - OQ1 - CC9 = $1145 for a 12 gauge gun. I don't have a "ding" discount for 12 to 10 bore. My SWAG be 3/4X so $860.