I bought this on ebay a while ago without any purpose really, it just looked in good shape and the shipping was more than the winning price. When it arrived it turned into a real mystery crank. The markings on the chainrings are three intersecting arrows, which appears to be a symbol for Takagi. What is really bizarre is the old JIS symbol on the inside of the crankarm. I say bizarre because the square taper is larger than JIS and subsequently larger than any square taper spindle I have ever seen or own. A somewhat knowledgeable bike friend said he had heard when Japan first started experimenting with square taper some manufacturers went to a larger square taper size prior to settling on the current JIS standard. This kind of makes sense, except if that is true, why is it stamped JIS? Check out the photos and tell me what you think.