Here's a list of "Key" and "Semi" key dates that I use for a quick, down and dirty, reference guide. These are only for mid to late 19th Century and 20th Century. Hopefully I didn't miss any. I'm not assuming that you don't have a list such as this. I'm only making it available if you don't or others might not have it as well. I hope that you continue to have fun preparing the wonderful coins for your daughter.
Flying Eagle and Indian Cents
1856, 1861, 1864-L, 1866, 1867, 1868, 1869/9, 1869, 1870-1878, 1908-S, 1909-S
Lincoln Cents
1909-S, 1909-S V.D.B, 1910-S, 1911-S, 1912-S, 1913-S, 1914-D, 1914-S, 1915-S, 1922-Plain, 1931-S, 1944-D/S, 1955/1955, 1972/1972, 1983 Doubled Die Rev., 1984 Doubled Ear, 1995 Doubled Die Obv.
Liberty Head "V" Nickels
1883 with CENTS, 1884-1888, 1894, 1912-S
Buffalo Nickels
1913-D T1, 1913-S T1, 1913-D T2, 1913-S T2, 1914, 1914/3, 1914-D, 1914-S, 1915-D, 1915-S,
1916 Doubled Die, 1917-D, 1917-S, 1918/17-D, 1918-D, 1918-S, 1919-D, 1926-S, 1931-S,
1935 Doubled Die, 1937-D 3-Legged
Jefferson Nickels
1939-D, 1942-45 Silver Wartime Issue, with large 'P', 'D', or 'S' on reverse,
1939 Doubled 'Monticello' and 'Five Cents', 1943/2, 1949-D/S, 1950-D, 1954-S/D, 1955-D/S
Barber Dimes
1892-S, 1894-O, 1895, 1895-O, 1896-O, 1896-S, 1897-O, 1901-S, 1903-S, 1904-S
Mercury Dimes
1916-D, 1921, 1921-D, 1926-S, 1931-D, 1942/41, 1942/41-D
Roosevelt Dimes
1950-S/D, 1982 with no mint mark, 1964-D Doubled Die Rev.
Barber Quarters
1892-S, 1896-S, 1901-S, 1913-S, 1914-S
Standing Liberty Quarters
1916, 1917 T1, 1917-D T1, 1917-S T1, 1917 T2, 1917-D T2, 1917-S T2, 1918-S, 1918/7-S, 1921, 1923-S
Washington Quarters
1932-D, 1932-S
Barber Half Dollars
1892-O, 1892-S, 1893-S, 1897-O, 1897-S, 1913, 1914, 1915
Walking Liberty Half Dollars
1916, 1916-D, 1916-S, 1917-D Obv., 1917-S Obv., 1921, 1921-D, 1938-D
Franklin Half Dollars
1955
Morgan Dollars
1878-CC, 1879-CC, 1880-CC, 1881-CC, 1882-CC, 1883-CC, 1884-CC, 1885-CC, 1889-CC, 1890-CC, 1891-CC, 1892-CC, 1893, 1893-CC, 1893-O, 1893-S, 1894, 1895, 1895-O, 1895-S, 1903-O, 1903-S, 1904-S
Peace Dollars
1921, 1928, 1934-S
Flying Eagle and Indian Cents
1856, 1861, 1864-L, 1866, 1867, 1868, 1869/9, 1869, 1870-1878, 1908-S, 1909-S
Lincoln Cents
1909-S, 1909-S V.D.B, 1910-S, 1911-S, 1912-S, 1913-S, 1914-D, 1914-S, 1915-S, 1922-Plain, 1931-S, 1944-D/S, 1955/1955, 1972/1972, 1983 Doubled Die Rev., 1984 Doubled Ear, 1995 Doubled Die Obv.
Liberty Head "V" Nickels
1883 with CENTS, 1884-1888, 1894, 1912-S
Buffalo Nickels
1913-D T1, 1913-S T1, 1913-D T2, 1913-S T2, 1914, 1914/3, 1914-D, 1914-S, 1915-D, 1915-S,
1916 Doubled Die, 1917-D, 1917-S, 1918/17-D, 1918-D, 1918-S, 1919-D, 1926-S, 1931-S,
1935 Doubled Die, 1937-D 3-Legged
Jefferson Nickels
1939-D, 1942-45 Silver Wartime Issue, with large 'P', 'D', or 'S' on reverse,
1939 Doubled 'Monticello' and 'Five Cents', 1943/2, 1949-D/S, 1950-D, 1954-S/D, 1955-D/S
Barber Dimes
1892-S, 1894-O, 1895, 1895-O, 1896-O, 1896-S, 1897-O, 1901-S, 1903-S, 1904-S
Mercury Dimes
1916-D, 1921, 1921-D, 1926-S, 1931-D, 1942/41, 1942/41-D
Roosevelt Dimes
1950-S/D, 1982 with no mint mark, 1964-D Doubled Die Rev.
Barber Quarters
1892-S, 1896-S, 1901-S, 1913-S, 1914-S
Standing Liberty Quarters
1916, 1917 T1, 1917-D T1, 1917-S T1, 1917 T2, 1917-D T2, 1917-S T2, 1918-S, 1918/7-S, 1921, 1923-S
Washington Quarters
1932-D, 1932-S
Barber Half Dollars
1892-O, 1892-S, 1893-S, 1897-O, 1897-S, 1913, 1914, 1915
Walking Liberty Half Dollars
1916, 1916-D, 1916-S, 1917-D Obv., 1917-S Obv., 1921, 1921-D, 1938-D
Franklin Half Dollars
1955
Morgan Dollars
1878-CC, 1879-CC, 1880-CC, 1881-CC, 1882-CC, 1883-CC, 1884-CC, 1885-CC, 1889-CC, 1890-CC, 1891-CC, 1892-CC, 1893, 1893-CC, 1893-O, 1893-S, 1894, 1895, 1895-O, 1895-S, 1903-O, 1903-S, 1904-S
Peace Dollars
1921, 1928, 1934-S
























