Let me get right to the point: If a guitar does not have a valid "Ibanez" logo on its headstock, then it's NOT an Ibanez guitar.
I'll explain the reasons behind this in a moment, but first, take a look at text from an ad run during the 1970s: That gets right to the point.
What does exist is a Trading Company named Hoshino Gakki Group.
That company owns the Ibanez and TAMA brands (as well as some other minor brands).
They are based in Japan, but also have a US subsidiary, Hoshino USA, headquartered in Bensalem, Pennsylvania.
Hoshino owns no manufacturing facilities beyond a small custom shop in California.
Currently, Ibanez brand guitars are sourced from factories in China, Indonesia, Korea, and Japan (and possibly other countries I don't know about).During the 1970s, Hoshino used a single Japanese manufacturer for its electric guitar production. Currently Fujigen makes its own line of self-branded instruments, but in the 1960s up through the present, it also contracts with a number of other companies to produce instruments with other brand names on them.Beginning in the late 1960s, Hoshino began contracting with Fujigen to produce Ibanez-branded instruments.Through the 1970s and early/mid 1980s, Fujigen was the exclusive manufacturer of electric Ibanez guitars and basses.Hoshino Gakki (the Japanese trading company that owns the "Ibanez" brand name) took great pains to address the issue way back then, but these days, nobody seems to take their word for it.
To understand why a lot of people get confused about the issue of whether a guitar is "made by Ibanez" or "made at the Ibanez factory" we have to look at the relationship between Hoshino, Fujigen, and "Ibanez". (Yes, it's confusing because even Hoshino refers to themselves as "Ibanez" in their modern advertisements.) There is no "Ibanez" company or factory.