Since the pinout is so similar to Sharp SM5, I was hoping it was a clone with slightly rearranged pins. I'm not very good at reverse engineering from die shots, but I don't think it is- the ROM appears to be 10 bits wide.
I have come across a couple of these. One marked Gakken 6814 in Lansay Football, and another marked GOLF (in Japanese) 6906 in Bandai Challenge Golf. I do not know anything about them, but I did decap 6814 and posted pics here: www.seanriddle.com/gakken6814topmetal.jpg
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