Photo via Wikimedia Commons (Hemingway's, on display)
One example. Colors, sub-models, and production years vary; the machine you find may differ.
The carriage folds forward over the keyboard, the whole thing fits in a small case, and it weighs less than 4 kg. The first truly portable typewriter, used by war correspondents and Hemingway. Three-bank keyboard with double shift that is uncomfortable by modern standards, but historically the machine that made typewriting in the field a thing you could do.
External, in their original form. The people who know these machines best — click through to read and watch.
Listings come and go. These show whatever Corona No. 3 machines are on the marketplace right now.
See Corona No. 3 listings on eBay marketplace
Some links here are affiliate links. If you find a machine through one I get a small share at no cost to you, and it doesn't change which machines I point to.