★CORRECTION!!★→5:50 When I wrote 百円玉, I mistook the stroke order of 玉, sorry. The 4th stroke and the 5th one is reverse. The dot is the last stroke.
★ABOUT THE PEN→The black pen I used is "ぺんてる 筆touchサインペン ブラック SES15C-A(Pentel Fude Touch Sign Pen, Black)" It is sold in Amazon(search by SES15C-A).
★CORRECTION 1:44 the reading of 七 is "shichi", not "shiti", sorry.