CREATE TABLE table_203_153 (id NUMBER, "stamp issue date" CLOB, "stamp set" CLOB, "#cards" CLOB, "card set ref" CLOB, "qty. issued" NUMBER)

how many stamp sets were released in the year 1975 ?
SELECT COUNT("stamp set") FROM table_203_153 WHERE "stamp issue date" = 1975
SELECT COUNT("stamp set") FROM "table_203_153" WHERE "stamp issue date" = 1975