I have wondered, what determines if a player gets a League Champion or World Series Champion ring? Just thought about that, because I remember reading a magazine article where a batboy for the Braves was awarded a 1999 National League Champion ring. Does the player have to play at least 1 game with the team during the regular season to determine this? Or does the player have to be with the team for a good portion of the season? I have read and heard that players not necessarily on the post-season roster may still get a ring, but what about the other players, the ones that were called up briefly throughout the season or in September?

It's really up to the organization but from what I've seen and heard besides the players and coaching staff, all executives support staff including club house members and even in some cases the wives of players have received rings. I know for a fact that the wives of the two Stanley Cup Championship Philadelphia Flyers, back in '74 and '75 received ladies version of the championship rings.

As I said, it just depends on the organization.

Baseball has no eligibility rules for rings. Each club buys the rings themselves and gives them to whoever they want to give them to.

It's up to the team management/ownership. Typically every player on the team at any point in the season will get a ring, as will everyone noteworthy in the front office.

The 2004 Red Sox (World Series champion Red Sox; ooooh, that always sounds good) gave rings to every player, even Nomar Garciaparra, who was traded away mid-season and didn't play in October. One of the cuppa-coffee relievers tried to sell his on eBay to benefit a charity (didn't sell IIRC; I don't remember the pitcher but, reviewing the roster, it may have been Jimmy Anderson). And of course Theo and all got rings too; hey, it'd been 86 years, let'em all have a little bling to look good while holding the trophy.

it is up to the owner of team and team policies! batboys have been known to get rings for the service to the team that won the championship! and a team with class will give a playoff share or ring to a guy who maybe was traded in midseason, but contributed to the teams pennant drive for the championship!

the teams and owner decide who gets the rings

Members of individual teams vote on share of any post-season financial bonus. But the organizations themselves decide who in the organization gets a ring.

Winning your league's pennant entitles a team to hand out rings, and it's up to each organization to decide who gets and who doesn't get that ring. The same is true of the World Series winning organization. There is, therefore, no set number of rings to be handed out, nor is there a set criteria for who gets them. After all, broadcasters for the team may get rings, and they have nothing whatsoever to do with how well a team did. If a broadcaster can be given a ring, why not a bat boy, who actually has an interactive role with the team during the game?