My first guess is Tomioka. Second guess is Cosina. You'll need to track down this lens with their name on it and compare the two. Looks like a nice lens.
I would guess it is one of the Japanese makers that made Vivitar lenses listed here:
https://www.cameraquest.com/VivLensManuf.htm
If made by Konica it would be a very good lens.
looking at pictures on the web, I'm 99% positive it was made by Chinon. the 2 lenses are almost exactly the same, and the difference was so subtle I think it was an earlier or later model or maybe just a different way that MW wanted theirs to be
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