The collector's value of the ring is tied to who received the ring. If it has a player or even a prominent coach's name on it, it is worth more. If it is an organizational ring it is worth less. If it's an organizational ring, it probably doesn't have a name on it.
I don't know that Moose Skowron kept all five of his World Series rings from his days as a player with the Yankees. But a White Sox World Series ring adds nothing to his legacy, although he would have worn it at post-2005 White Sox functions.
If you're interested in bidding, you should demand to know from the seller though personal communcation who the ring belonged to because it is such a serious consideration. A reputable seller will share that information with you, even if the public listing doesn't have an illustration of the side of the ring where the name is supposed to be.