At the end of each race, the judges shall determine the proper order of finish and upon such determination having been made the public shall be so informed by the word “official” being lighted on the tote commission in the infield of the track or upon failure of such device by public announcement. Upon the lighting of such word “official” or upon its public announcement, the result of the race for pari-mutuel purposes shall be final and no appeal therefrom shall be allowed. Any ruling of the judges or of the Harness Racing Commission with regard to the award of purse money made after the sign “official” has been purposely displayed shall have no bearing on the mutuel payoff. The judges shall advise the manager of the pari-mutuel department and the representative of the State Tax Commission and the Harness Racing Commission in writing of the official placement of the horses. When no mechanical or electrical indication of the official finish of the race is used between the judges and the mutuel department, no payoff shall be made until receipt of such written notice.