Famicom CAI Report Cassette Envelope NHK Gakuen

Thank you for looking.

This is a protective envelope for the Family Computer CAI Report Cassette that was used for learning with the Family Computer through NHK Gakuen's correspondence course.
This is a retro educational item used in NHK Gakuen's correspondence course.
This envelope was used to put the cassette in and send it back using a submission envelope.

It cannot be used for its original purpose now, but how about it as a rare collectible?
There are some stains.
Please consider this item understanding that it is used.
Also, please note that it has been stored at home.
There are no smokers or pets in the household.

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