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Robot Detective 01 The Murderous Salesman of BAD – April 5, 1973
Robot Detective (ロボット刑事 Robotto Keiji) is a Tokusatsu superhero TV series. Created by Shotaro Ishinomori, the series was produced by Toei Company Ltd. and broadcast on Fuji TV from April 5 to September 27, 1973, with a total of 26 episodes.

On April 2020, Robot Detective became one of the 70 shows to stream on the Toei Tokusatsu World Youtube channel.
Above information from From Tokupedia
I checked and it is correct the Jiro Chiba played both Taki in Kamen Rider (1971) and Shinzo Go, the junior partner in Robot Detective. [LINK]
This is part of the Celebrate Ishinomori initiative.
Visit my RedBubble store for some designs I have made. I am working on making a whole series of Comic stuff that I think you’ll like.