It is the standard Kagami of the New Year, and it was likely to be usual, and there was not yet.
PS: There was a material of Mr. Mizuki Hitoshi in front of it, and it mistake the direction of the three-way hole.
お正月の定番鏡餅です、普通にありそうでしたがまだなかったので・・・
追記:かなり前にみずきひとし氏の素材がありましたね、それに三方の穴の方向まちがえてた・・・