Here is a list of Robeson tang dates to help you closer date your stamping and date your knife. The shield eludes me at the moment but others may have an idea. The value of the knife is subject to quality and condition and even though there are several books out there that generalize what a price may be I recommend that you look on Ebay at listings similar to your knife.
It looks like you got a very nice vintage Robeson on your hands
Sunburst
M.F. ROBESON 1880-1884
ROBESON/CUTLERY Co, ENGLAND 1885-1890
ROBESON/CUTLERY/Co, ROBESON/CUT. Co,
PREMIER, R.C. Co, GERMANY 1891-1895
THE/ROBESON/CUT. CO/ROCHESTER, N.Y. 1896-1899
THE R.C. CO./ROCHESTER 1896-1899
ROBESON/CUTLERY 1896-1899
ROBESON/CO./CUTLERY 1900-1916
R.C./CO. 1900-1939
TERRIER/CUTLERY/ROCHESTER, N.Y. 1910-1916
MADE/IN U.S.A. 1911-1919
ROBESON/ShurEdge/U.S.A. 1911-1921
ROBESON/DEMONSTRATOR 1911-1939
ROBESON/ShurEdge/U.S.A. 1916-1939
ROBESON/U.S.A./CUTLERY(Master Blade) 1917-1939
ROBESON/CUTLERY/ROCHESTER 1917-1939
ROBESON/ShurEdge/ROCHESTER 1922-1939
ROBESON/U.SA./CUTLERY(Secondary Blade) 1922-1939
ROBESON/SHUREDGE/U.S.A. 1940-1964
ROBESON/ (Pattern Number)/U.S.A. 1965-1977
Other less known Robeson tang marks and manufacturing dates are:
GENESEE 1891-1895
FILLMORE/CUTLERY/Co 1891-1895
PERRYCUTL.CO./PERRY,N.Y. 1919-1929