Typewriter Oliver Model 5. `1908.
Introduction: Debuted around 1907, it was a significant update from earlier Olivers, featuring a larger base and fully enclosed key-lever standards for a cleaner look.
Design: It used the Oliver's signature inverted 'U'-shaped typebars and downstroke mechanism, famously nicknamed the "bat-wing" for its appearance.
Innovations: Introduced the tab key, backspacer, and later, the unique Printype font (which looked like printed text), along with an optional pencil ruling device.
Keyboard: Featured a 28-key, three-row QWERTY layout, differing from the 32-key No. 6 model meant for European markets.
Production: Manufactured in Woodstock, Illinois, it was a bestseller in North America.
Legacy: The No. 5 was the last major model designed under the inventor, Thomas Oliver, before the company was sold and reorganized.