Would one of the more knowledgable members here be so kind as to give an approximate value of a Charles Hellis back action, exposed hammer SxS .410 shotgun with 28" steel barrels and straight grip. I am looking at one now and don,t have a clue as to what to offer as the owner, who inherited it is in the same quandry. Thank you all in advance. Sorry, no pics. Have a great Fourth of July. Jim D.