From the Famitsu marketing bulleting it’s achieved the sale after in released 4 days
Nintendo released the domestic estimated sales volume of home-use game machine “Nintendo Classic Mini Super Famicom” released on the 5th as a preliminary report issuing on the Gz Brain the game magazine which released on October 11th.
“Nintendo Classic Mini Super Famicom” Sales Breakout!
（Aggregation period: October 5, 2017 to October 8, 2017 / Number of days sold: 4 days) Estimated domestic sales: 368, 913 units
The sales volume for 4 days (in first week) from “Nintendo Classic Mini Super Famicom” was sold out for 360,000 units. This game machine was reprinted after miniaturizing the popular home game machine “Super Famicom” which released in 1990, including 21 unreleased software titles and was reproduced in “Nintendo Classic Mini Family Computer ” which released in November 2016 and it was attracted a lot of attention. In the future, they are expecting for the further growth in sales volume for this Christmas and holiday shopping season.
REF : https://www.charabiz.com/article_detail.php?article_id=9753
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