Underwood Typewriter #5
Underwood Model number 5 were made from late 1900 until late 1931 or early 1932. the No. 5 types 84 characters. The No. 5 was the quintessential Underwood. Millions of these machines were used by secretaries, journalists, government officials, and writers throughout the first half of the twentieth century. Later Underwood's were superficially modernized, but retained the same basic mechanism. The name "No. 5" was even given to some of these later typewriters, in honor of the model that made the company's fortune.
I believe the cobwebs on this just prove it aged well.