Table schema:
CREATE TABLE table_name_74 (date__ddmmyyyy_ VARCHAR, soviet_unit VARCHAR, enemy_aircraft VARCHAR)

Question: 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.?"