Please check the 'Shotguns', 'FAQ', and 'Photo Trail' here Tom
http://www.lcsmith.org/index.html
You can determine the grade - should have a number (pre-1913) or letter (post-1913) beneath the serial number on the receiver, date of manufacture - about 1904, and how to obtain a research letter from the LCSCA
http://www.lcsmith.org/shotguns/researchdivision.html