Thanks SKY.
Does that mean that two SG3 typewriters, with the same number, for example 23, could exchange their carriages? and everything would work fine...
 

Hello pete.
The missing dial is actually a light. That's why it seemed to me that the machine was a poweiter. But it lacks other features. It does not have the inscription "Cordless". The carriage is different. It does not have interchangeable keys. and it doesn't have the powerSpace either. Maybe it is a kind of hybrid for export and they made it with what was left over from other models, they only added the letter Ñ. I'm looking for it on different sales pages to see if I can find another example of this model.
https://typewriterdatabase.com/Smith+Corona.Poweriter.86.bmys

Hi Pete!
  In the end I bought the SGE 30.
  I had a lot of work and I had little free time at home. So as soon as the typewriter arrived, I cleaned it a little, saw that it had some work to do before getting it in perfect condition, so I put it away and have barely had time to use it.
The machine was in pretty good condition, except for a dent on the left side. Apparently it was kept in its case for many years, and at some point it fell, the impact was largely absorbed by the case.  
The case is made of wood so with glue and a press I solved it.
After cleaning the machine it started working, but a couple of the keys didn't respond so I had to keep cleaning and moving everything until they responded.
The only thing that doesn't work is Backspace.
Otherwise it is in good condition. The electric cable is very long. The letter is 11 CPI.
(#84 Congres Elite 11CPI, I think)
What impressed me most about the machine were the materials with which it is built, the belts, for example, are the original ones and are in perfect condition. 
Today I took photos, I have to upload them to typewriterdatabase.

Greetings from Argentina!


[img]https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg__9AvVSDFijqU0jBAIP_LOwCMs-7ULigOiidPcy49QlRnG-gFcu9lYBVyR0QJcOnO2QQWTXde8dEghIydCUiRHLDuUvxH_g-jx83zOizbEsUz6TM3oxhoFVjbenotvGJS3V9c9v3UQ4VhtrKfQlxTUCwqXDpYmRBv0b_MLkS672Dk4rYB1I-UGSaGZ7k/s8

Is there a difference in size between the Royal O Model and the Royal Arrow? I have an Arrow and the model O seems to be smaller, but maybe it's my idea.

thanks Pete E.!
I asked the question because I'm watching the series "Mad men", and in one episode, an employee steals a Selectric 1. I thought: is it realistic? Would they be so expensive that a person with a good job couldn't buy them? On the other hand, many other machines appear in the series, even in disuse, the character could have stolen another.