Short note about reverses
All types have identical polished reverses. For this reason reverses will be ignored in our further discussion. It is only necessary to notice that on some copies of type 7 there is a stamp mark in the form of latin letter M which usually can be found on the centre of the "tail". This is Osaka Mint mark. Also it will be interesting to note that on "tails" of type 1 and 2 we usually meet two deep thin sawcuts which repeat the bottom part of a pole (sawcuts on the majority of signs are made inaccurately and often have different length). At types 3 and 4 such sawcuts are almost imperceptible (or are only slightly indicated). Types 5 and type 6 have wide sawcuts of the correct geometrical form of a square or a rectangle. Type 7 has sawcuts of the form of a square. This nuance can be studied on the following two compilations of most common variants. Compilations also show us potential instability of this feature.