M210909a
Crowned oval with initials "COR" above "W. GERMANY".
It seems that this COR was a distributor or retailer dealing with items from various countries, including Germany, Japan and Taiwan.
M210909a
Crowned oval with initials "COR" above "W. GERMANY".
M210909b
Crowned oval with initials "COR", date, series name, and "MADE IN JAPAN" sticker.
M210909c
Crowned oval with initials "COR", date, series name, and "TAIWAN" sticker.
M210909d
Crowned oval with initials "COR" above "TAIWAN".
M210909e
Crowned oval with initials "COR" (here above the date "1987").