Model 3 Folding
L. C. Smith Bros. & Corona Typewriter, Inc.
Frank S. Rose
Original Price: $49.50-50 (US); $69 (Canada)
This typewriter was modeled after the Standard Folding typewriter. According to Michael Adler, this model is "one of the most ubiquitous of all old typewriters", with over 700,000 produced. The advertisement to your left is from page 96 of the September 1922 issue of Popular Science Monthly, retrieved via Google Books, https://books.google.com.