I wondered what had ever happened to the Waterloo Diamonds, after a cup with their logo had faded to near oblivion. From this excerpt from a 1999 book about female entrepreneurs, I found that the Diamonds became the Lansing Lugnuts, one of the wackier names in minor league baseball. (The Diamonds had other names before that while in Waterloo.)
The Diamonds/Lugnuts are single-A baseball; Waterloo has a different team now, the Bucks, which are part of a “collegiate summer baseball league.”