Keyboard
For the Italian market the keyboard is in the QZERTY layout, as with most Italian machines (excluding modern computer keyboards). Aside from the typing keys, the keyboard includes a space bar, two shift keys, one caps lock key, a backspace key and a margin release key. Of these, only the backspace key bears a mark on it (an arrow pointing right), while the other five mentioned are left anonymous.
The character set conspicuously lacks the numbers 0 and 1, which are supposed to be substituted by the uppercase "o" and lowercase "l"'. Although this may seem like a strange absence today, this was actually common on older typewriters.
Also lacking are the keys for uppercase accented vowels, some of which are present in Italian; however, these characters usually are not found on modern keyboards, either.
Read more about this topic: Olivetti Lettera 22