The uncut b&w panels are listed in Gary Engel's Japanese Baseball Card Guide as a 1980 JA9 Four Card Panel Set. There are 20 panels for a total of 80 cards. They were produced in the U.S., but it is not known who made them.
The Chiba Lotte Marines postcards are from around 1989.
Let me know if you have any other questions.
Robert
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