AHI and AN toys were produced by Naito Shoten. They worked closely with Nomura in the 1960s and mainly produced tin toy robots.
It is presumed that the Naito Shoten company was Tokyo-based and produced only a small selection of toys in the mid-1950s. But there is also a theory that Naito Shoten was a reseller of Nomura toy variations.
According to an article in the June 2003 issue of 'Toy Cars and Models' magazine, AHI stands for Azrak-Hamway International, Inc., a US toy distributor/manufacturer.