CREATE TABLE table_name_74 (date__ddmmyyyy_ VARCHAR(255), soviet_unit VARCHAR(255), enemy_aircraft VARCHAR(255))
What was the date of the victory when the Soviet Unit was 73 giap, and the Enemy Aircraft was bf.109g-? w.nr.?
    
SQL: SELECT date__ddmmyyyy_ FROM table_name_74 WHERE soviet_unit = "73 giap" AND enemy_aircraft = "bf.109g-? w.nr.?"