John Maersch Sr., retired assistant treasurer of the Vollrath company, died suddenly Sunday morning at St. Nicholas hospital.  He was 79 years old. Born February 4, 1872 in Germany, he came to the United States with his parents, Jacob and Fredricka Marnet Maersch, who settled her 64 years ago.  Mr. Maersch attended the local schools and graduated from the Sheboygan Business college.  He was a member of the Vollrath company's 50-Year club being affiliated with the concern for 51 years.  At the time of his retirement on 1938, he was the assistant treasurer of the company.  Since then he made his home at 1324 N. Sixth street.  Mr. Maersch's marriage to Miss Olive Liebl was solemnized at Holy Name church by the late Rt. Rev. Msgr. Dominic F. Thill on June 20, 1907.  She died August 13, 1948.  A faithful member of Holy Name church, he was affiliated with the Holy Name society of the parish, the Knights of Columbus and the KC's Fourth Degree assembly.  Survivors are four sons, William J., Sheboygan, Lt. Col. John M., with the army in Korea, and Robert E. and Arthur G. of Milwaukee; a daughter Miss Olive Marie, at home; four grandchildren, and two brothers, Frank P., Sheboygan, and Henry, Fort Worth, Tex.  In addition to his wife, one brother and two sisters preceded him in death.  Funeral services will be held 9:30 am.  Wednesday at Gerend's Funeral home, and at 10 am. with a solemn requiem high mass at Holy Name church.   Burial will be in the family lot in Calvary cemetery.  The body will lie in state at the funeral home after 7 o'clock this evening.  Members of the Ushers society of Holy Name parish, the Holy Name society and the Knights of Columbus will hold a joint vigil at the funeral home at 7pm. Tuesday.