It depends on the following.
If is all Remington parts, marked with a "R" (Gotta check the rifle Top to Bottom, I mean all parts including the rear/front sight & extractor & the follower & the firing pin & the handguards & ect, they all have to match the maker stamped on the receiver to be a totally original Remington from what I've researched about 1917's).
Also does it have a original WW1 dated barrel (10-18 ect) or a later WW2 barrel refurb (JA is one maker, there's another I can't think of right now, HS I think) & barrel condition inside & out( L&G condition, pits, rust ect) + stock markings/stamps & is it blued or parkerized.
Plus, does the barrel date (if a WW1 BBL) match the month the rifle was made? I found a chart that explained this maker serial number/barrel dating match on the net years ago using Google. I guess that's important to some big time collectors.
Plus the price varies beween Remington, Eddystone & Winchester made 1917's & all depends on overall conditon listed above^^^^.
I've seen them from as low as $50-$100 (If it has been Sportered/chopped barrel, cut rear sight ears, ect or just really rough) to as much as $600+ for a minty one.
I know a little about them 1917's, but am far from a expect. Hope this info helps.