Hello! Since 1980, foreign exchange certificates have been issued 1.5. 1 yuan, 5 yuan, 10 yuan, 50 yuan, 100 yuan, etc. , and they all have certain collection value. The market price of 10 new products has reached about 7000 yuan/set. Only small denominations have low collection value. The market reference price of 50 cents is: new products are scattered about 10 yuan/piece, hundreds of serial numbers are cut about 15 yuan/piece, and thousands of serial numbers are bundled about 17 yuan/piece.

Reminder: There is only version 1979 in the corner of foreign exchange certificates, but there is no version 1975.