Antique banknotes and other paper money represent unique historical documentation. Their images directly reflect historical events. This might be a reason why notaphily became a world-wide collectors' interest in the second half of the 20th century. Of course, antique banknotes and other rare issues, such as coupons, unissued banknotes and others are the most popular. Among the rare Czechoslovak banknotes are the national banknotes of the First Republic, issues I and II.