Jay,

See if you can find actual information contemporary to the time and not suppositions by historians. What I have found is the sandwich is an obvious derivative of wiener schnitzel. Nick Freinstein in Huntington, IN early history had called them veal sandwiches. Wiener Schnitzel from many sources say it was coined that about 1857 to 1862, came from Vienna, Austria and spread to Germany. The idea of tenderizing and breading meat goes back to Roman times. The first Czechs started arriving in Cedar Rapids in 1852 so they do go back aways.

So far from what I can find, the actual printed word referencing the sandwich goes back to Nick Freinstein in Huntington, IN.