A nice one with it's original chinstraps..............!
Not sure of current prices for US M1 lids, but prices seem to be soaring these days.
They run the whole gamut due to condition, markings, completeness, etc.
( Ones that were serviceable crossed-over into the Korean War too)
I used to be able to buy these shells at army surplus stores
not too long ago for $20 !
I sometimes 'watch' M1 helmets on ebay. There are many there, and you
might find one similar to yours and see what it ends up selling for.
I would say 40 to 70 dollars. depends how you sell it. Ebay will give you sort of idea, as walkwolf said. I can find front seams from time to time for $40 localy, internet can probablly get you a few extra dallors for it.
I've been watching M-1s pretty close on Ebay lately. A Front Seamed McCord with a good chin strap (no liner) will, at a minimum, fetch you $50 and go on up to &70-$80 if shell is solid, no stress cracks, dings, dents, missing paint and solid texture. If "S" stamped add another $20-40 for a real clean lind. I just sold a pretty clean McCord, with no strap and a dent in the crown for $30 to give you an idea.