Finally found out what is in the Whitman 20th and 21st Century type set versus what is in just the 20th century one. Been looking for months as I bought my little boy the 20th century and was trying to decide if I wanted to get that one for my new baby or get the 20th and 21st one.
20th century



20th and 21st century



Ok so the 20th century has 39 slots and the 20th and 21st century has 40 slots so it only gained one slot.
Additions to the new set with 21st century
2009,
Lincoln Cent: Centennial
2010-date,
Lincoln Cent: Shield reverse
2004-2005,
Jefferson nickel: Westward Journey
2006-date,
Jefferson nickel: Return to Monticello
1999-2008, Washington
Statehood Quarter2009, Washington Territorial/DC Quarter
2010-2021, Washington National Parks Quarter
2000-2008,
Sacagawea dollar2009-date,
Native American dollar2007-date,
Presidential dollar So that is an additional 10 coins but they only added one spot so what did they take away it looks like they did away with all the varieties to not increase the size of the set.
Retractions from the 20th Century set
1909,
Lincoln Cent: VDB
1913,
Buffalo nickel: Type 1
1938-1965/1966-date
Jefferson nickel (down to one spot 1938-2003, this was an odd addition anyways as the Nickel didn't change in 1966)
1916-1917,
Standing Liberty quarter: Type 1
1976, Washington Bicentennial Quarter: Silver Clad
1976, Kennedy Bicentennial Half: Silver Clad
1971,
Ike dollar: Silver Clad
1976,
Ike dollar: Type 2 (went to just one 1976 dollar)
1976,
Ike dollar: Silver Clad
I don't know I kind of like the 20th Century set better and its clearly a more valuable set with additions of the T1
Standing Liberty quarter, T1 Buffalo, VDB Lincoln and all the extra silver varieties (4 in total). I mean the Jefferson was always odd and I just put a modern one in that 1966-date spot anyways. I like the additions though but a lot of them are odd to have just one year additions plus I have done sets for some of those (statehood, National Parks, Presidential, Sacagawea and
Native American dollars or 5 of the additions).
The new set just looks like they tried to make it a cheaper set to do and took out a lot of the nicer varieties.