Speedodrive- can anyone identify?

Is anyone able to identify which make of bike this speedodrive is from

It came in a bag with made in Japan on it. It also had a part number 743.0410.00 or 743.0410.000 on it. Maybe someone will recognise this format of part numbering.

The spindle hole is 15mm I think. They were in a box of parts from the 1970s 1980s so could be greater than 30 years old.

Thanks for your time any help appreciated.

unknown speedo drive japan.jpg

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