Having some difficulties downloading pics but here is some more info after inspecting these arms. Both have shiney bores. Looks like 4 lands. Other than dents and dings both stocks are intact, no cracks.
1903: near muzzle is tamped with the "bursting bomb," SC above, 6 43 below. On the bottom of the stock, in front of the magazine there is a faint mark that may be a stamping of two circles, on of which has a 1 in it. Bolt handle and cocking piece have tiny 'R' stamped. Receiver U.S., SMITH-CORONA, MODEL 03-A3, 473###X. Can't find much else.
1917: same bomb on barrel with E above, 12-18 under. Bolt parts have E or EN stamped on them, Bomb symbol on bolt handle and left side of receiver. A small indistinguishable symbol on the safety with a 51 and a reversed E. Same symbol stamped on the wood behind trigger guard with IS above and 58 below. Receiver stamped U.S., Model of 1917, Eddystone, 13###xx.
I'll try with the pic's again later. Looks like valuating these things is a bit of a can of worms. Looking forward to things opening up again so we can have gun shows etc. for in person inspections and dealings. Before I sell I'd like to try both of these rifles. If I can shoot either better than my K38 I'll be keeping one.