In Biographical Sketches of Newton County (MO) Families (Vol. 1, p. 145), I found a reference to a VASSER. In an account of Joel Jacobs, Sr., b TN 1823, it states that at the age of 70 he married (his third) Jane VASSER of Dayton Township. "Jane had just been granted a divorce from Richard Vasser on 1 January 1893." Joel died 6 June 1900. Just in case this has any connection with your VASSARs.