Muscatine

There is a Riverdale, Iowa (where Alcoa is).  You might try that for starters.  I think that they have a High School.  Tom.

Any chance the spelling is "Heimburger"?  If so, classmates.com has someone who matches though that's Riverdale High in Port Byron IL rather than IA.  I couldn't find a "Riverdale High" in IA.

You could also check with the ring manufacturer.  Looks like Jostens has a "found rings" page - though kinda sad they only have 4 years worth of records!

I googled Jack A. Heinburger also. Found no matches. Thought it to be some kind of joke, like "Mike Hunt". So, if it's a misspelling and for real, I apologize to jrfan. 

Hey Jr...

  I'm so glad to see you posting again!  I've asked about you a few times.  Glad you are ok.  It is so awesome that you, (and the others that have posted), care about this person getting his ring back.  I HOPE he appreciates the effort. 

  Tarall, it's nice to see & hear that you are listening to the posts & desires of this board.  You went the extra mile; that is awesome.  Thank you. 

  C'mon Jr.  THREE MILLION Jack A. Heinbergers?  Could it maybe be "only a million or 2?", you goof ball?  "Wink & LOL!". 

  We need to talk.  My husband has some Dale memorabilia he is willing to sell.  Got a "MILLION or  two" to spare?