Portable typewriters of the 1920s

Royal Model OT

Underwood Standard Portable

Remington Portable 2

Corona Four

The best portable typewriter available in the late 1920s, by a narrow margin, is the Underwood Standard Portable Typewriter with Standard Four Bank Keyboard. So what is the actual model name for this thing?

Both the Royal and the Underwood are actually from the 1930s, I know…but they both could have been bought in 1929.

Sent from my Royal Model OT and my Underwood Standard Portable

Corona Four / Obsolete Communication Forms

1925 Corona Four H608372

When mentioning the pinnacle of 1930s portable typewriter designs, I am not including all European designs since I've only had the chance to use an Olympia. I understand that Triumph or Continental might be the winner.

Typed on my new Corona Four