Where it comes from
The line in the source
"productTitle": "拡張パック「ブラックコレクション」", "releaseDate": "2010年12月17日（金）", "description": "カード／5枚" Explore / Figure
Record
JP expansion-pack release date, 17 December 2010 | 2010 | year to February 2011 (Mar 2010-Feb 2011) | print-year Apr 2010-Mar 2011
17 December 2010 17 December 2010 | 2010 | year to February 2011 (Mar 2010-Feb 2011) | print-year Apr 2010-Mar 2011
FiledTaken from a filing, a registry or the company’s own published page.
Found in one pass only. The research team reads every source twice, independently; this record turned up in one reading but not the other, so treat it as less certain than its grade.