It's a Minivac 601, from 1961. Brand new, it cost $85. Click to embiggen. The advertising was very Space Age:
The advertising leaflet stated "The Minivac 601 is a unique digital computer - the small brother of huge electronic brains that are the new tools of science and industry".Unfortunately, the world would have to wait another decade for the software that would actually make a personal computer the Must-Have accessory for every geeky kid. I should know.