1930s Japanese Sumo Menko Lone Soles

Unfortunately, my Lone Sole pile is slowly accumulating more cards than are being matched.  This pile has lone examples of particular sets that I try and hook up a sole-mate to so I can catalogue them in my book.  These past few months, 4 more have entered.....hopefully destined to leave before I do.

First up we have an early 1930s halftone M-series menko of Shinkai.  I would hope I can stumble across more of these as they have a very distinctive back.

 Next is a beautiful gold-gilded drawing of Kagamiiwa in the M-series from the early 1930s.  Another distinctive back.

 I haven't been able to translate this back, but looks like a kimarite finishing move on the front and the style is from the early 1930s as well.

 Lastly, an R-series of Taroyama from the mid 1930s.