It always gets down to originality and condition. The larger IHC parts, incl bolt, trigger housing, hammer, and op rod will show a drawing number with the letters "IHC" as a suffix. The elevation knob, windage knob, and gas plug will be marked IHC in addition to other letters. An IHC barrel should show the letters "LMR" before the drawing number on the rt side of the barrel. Smaller IHC parts, incl follower, clip latch (on the inner side), and op rod catch will often show a single letter. Safety will be marked with the letter "F". The rear sight base will be marked with a single letter on the bottom. An original IHC stock will show a 4 digit Julian date on the bottom of the op rod channel. The stock looks fairly beat and the bore appears rough. Some would be inclined to replace or refinish the wood if not original. The metal finish is worn which would tempt some to re-parkerize it. From the looks of the bore I'd probably be inclined to replace the barrel. The s/n shows that this is one of the last IHCs built in late 1955 using a receiver supplied to IHC by Springfield Armory. Some collectors would pay a bit more for this variation.
Tough to say on price. An original IHC in VG + condition would probably fetch $1500 nowadays. If you factor in a barrel replacement ($300-400), a re-park job and a replacement stock, somewhat less.