Epson 1170 - Manual (Page 78)

Typestyles
Character pitch
You can select a character pitch from the control panel. To select a
pitch, press the PITCH button until the indicator light next to the
desired pitch comes on.
The table below shows the character pitches available for each
font.
Script-C 0 0 0 0 0
Orator 0 0 0 0
Orator-S 0 0 0 0
OCR-B 0 0 0 0
In the or modes, each character gets an
equal amount of space. In proportional mode, the spacing varies
from character to character. A narrow letter like the lowercase
receives less space than an uppercase
The printout below compares the different pitches:
This is printing.
This is 12 printing.
This printing.
This is 17
This is 20 printing.
This is proportional printing.
3-22 Using the Printer