CREATE TABLE table_18143210_2 (first_season_of_current_spell_in_top_division VARCHAR, first_season_in_top_division VARCHAR)

When was the 'first season of current spell in top division' if the first season in top division is in 1964-65?
SELECT first_season_of_current_spell_in_top_division FROM table_18143210_2 WHERE first_season_in_top_division = "1964-65"
SELECT "first_season_of_current_spell_in_top_division" FROM "table_18143210_2" WHERE "1964-65" = "first_season_in_top_division"