Today I was able to locate the record of Robert Joseph Welcheck's first marriage.
We had learned of his first wife, Jennie, from the 1920 U.S. Fed. census giving her birth year of 1899 and marriage yr of c.1916. Now know we have her maiden name of Soukup and date married as well as her birth date (as they made note of her 18th birthday for the marriage).
Now she is no longer Jennie [wife of Robert J Welcheck] in my database; she is Jennie Soukup.