Below for comment are digital images of a Japan 5 sen, year 10, 1877 in my collection. Type 1,2,3,4 ? OBVERSE REVERSE
Very nice. I just bought my first Japanese coin last week. A very affordable 1923 50 Sen. It caught my eye and I thought it would be a great coin to break into the Japanese arena. Yours smokes my 50 Sen though!
Your coin's "Sen" (銭) has a hook on the lower right stroke. And for "Mei", (明) the bottom stroke of the left side does not extend up to touch the right side. So, if I understand the Numista table right, it would be obverse 2, reverse 4.