hi yvonne,
your marlin was manufactured in 1884, and from what i've found on your 1903, if it was a springfield armory rifle, has a manufacture date of 1925. check out this site,
http://oldguns.net/sn_php/mildateslookup.php
as for value, you'ld have to have a hands-on appraisal done to any real sense of worth.
JMHO
Kim