I have decided that I want to put together some type sets and create some variety. One type set folder that I have is from Whitman and is a 20th century type set. On the directions, it suggests more towards collecting by type (even if a particular coins falls outside the 20th century) rather than collecting by type and date. For example, the folder suggests that I could pick one of my 1893-S Morgan dollars to fill the Morgan spot, rather than say a 1921 (20th century) Morgan. I know it is just symantics, but shouldn't a 20th century type set only contain coins that were actually minted during the 20th century, or should it be any date so long as the type existed in the 20th century, or am I just thinking about this too much?
-Robert