Both cards #316 and 321 are found with and without a statement below the cartoon on the back stating that they were optioned to the minor leagues.
Cards With the Option statement usually sell for about $7 to $8 in NM while
those that DO Not have the Option statement sell for about 10 times this much.
Thet are very hard cards to find especially in nice condition.
Here's a link to all the info on the 1959 set including a picture of card #321 showing the Option statement.
http://www.psacard.com/articles/arti...tml?artid=5771