You always get the option of using the current OR proceeding season, if your era is in season 1960 or earlier...
That applies up to and including the 1960 season.
Does not apply to players you acquire from a team of a different era. If you traded for 1966 Willie Mays, you could only use his current season. In '67 you would have to use his '67 season, and so on.
Here's where you can have an option... If you acquire a draft pick from one of the other eras, you will make that pick in that particular draft. In this case, you will get the option to use current or proceeding season, for as long as you possess that player. (I will also keep a list of these)
5/6/2016 8:53 PM (edited)