Just a cursory glance at its carriage says it all: your typewriter is just an Olivetti Lexikon 83 in different clothing.

It's my understanding, and you would need to confirm this, SCM (Smith-Corona Marchant) bought the Olivetti design (some claim the factory that it was made in too) and began marketing their Vantage and Intrepid versions of the Lexikon 82 and 82. If you look at the Vantage model it is even more unmistakably an Olivetti design. 

Olivetti did make typewriters in Scotland; my favorite Lettera 22 was made in the Glasgow factory. And there's nothing odd about one manufacturer licensing another to make their machines, although I don't think that's the case here. For example, Underwood sold Remington models at one point, some Empire machines were actually Hermes designs, and just about everyone - it seems - made their own version of the Patria portable. Even less unusual was the practice of one typewriter manufacturer buying out another and producing its machine as its own. 

Lateness? Many of these companies are still around even if typewriters are no longer in the picture. For example, in 1979 Volkswagen (yes, the car manufacturer) effectively became the new owner of Triumph-Adler, and Royal. Seven years later Volkswagen sold its shares to Olivetti, and ownership of Royal was now in Italian hands. In 2004 Royal was once again an American company. Triumph-Adler, Royal and Olivetti are all still still in business.
 

What I meant by lateness is that of the typewriter industry. I know Olivetti is still big in Italy, Smith-Corona makes thermal labels, not sure what T-A is doing, and Royal is located just a few towns over from where I live (we actually own a Royal paper shredder. Kinda weird...)

But what do I know about the business dealing of  failing industry 30 years ago?