Swoobie, I do not know the value of that particular gun.

I do know that Champlin Arms had a 1960's era W.R. sidelock in 20 gauge with 26 inch barrels, double triggers, original W.R. case with accessories - looked to have never been used. It sat on their website for nearly a year and was priced at $25K. It is gone now, I assume sold or the original consigner took it back.

Hope this helps.