1970s Underwood 315
Up for sale is a modern-looking Underwood 315 which was made sometime in the 1970s in Spain after Olivetti and Underwood merged. If you're familiar with Olivetti portables from the '60s and '70s, then you'll find the inner workings of this machine are extremely alike the other Olivetti machines. The owner's manual for this machine can be found here: https://site.xavier.edu/polt/typewriters/Underwood315.pdf
The universal ribbons sold on this site fit this machine perfectly, as do any other Olivetti portable ribbons you can buy elsewhere online.
This typewriter is fully functional right down to the bell, and is a great, reliable typer. It's also in exceptional shape cosmetically, with very few signs of wear. The leather carrying case is in good shape overall, although there is some wear at the seam (see very last picture) The body of this machine is plastic, and it's a relatively small machine, so it's on the lightweight side and scores highly in portability. Keep in mind that this typewriter's shade of blue is hard to photograph- the blue is actually a bit more of a teal or dark turquoise as you may be able to pick up if you look at other 315's online.
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If you're looking for an interesting-looking slim portable that is easy to use and can be used reliably and heavily, then this is a good option.