I'm stumped.
On first glance I thought early Infinitys, Monitor Jr. for example as the cabinet construction is similar , but the badge is different, and the font (which JR.s did not have, only the symbol) doesn't seem quite right, JMO it's a newer style font.
Also not familiar with that grille cloth, maybe the grilles have been re-covered.
One last possible WAG, some non USA product. There were some models made at/for overseas, thought at that early stage of Infinity that they *seem* to be from I'm not sure Infinity was big enough to have gone outside the USA as far as manufacturing.