Hard to say for sure but based on how the case looks blow molded and the spherical keycaps I suspect that it might be a Futaba manufactured vintage keyboard in the image. Couldn’t tell you what model though, I’m sorry.

The blow molded case and spherical caps and oddly shaped tab and lone spacebar on the bottom row are all things that used to be common in the late 70s and early 80s but are no longer common in keyboard design so I do think it is authentic vintage even though I don’t know much more than a strong guess about the manufacturer (Futaba) and an educated guess about the switch (Futaba MD, MR, or ML series) and keycaps (doubleshot injection molded ABS).

Hope this helps!