Before the internet, there was your local newspaper, a spigot of knowledge compared to today’s avalanche of web data. The “Ask Millie B.” column above offers no real information about the Dayton Portable Typewriter, but it does provide a new serial number for surviving machines: AY294, for a portable owned by “R.C.” of Beavercreek back in 1985. (The prefix is likely misstated, as AX for greenish machines and BN for black machines are the known prefixes.) This marks the 9th noted Dayton.
The Dayton Portable Typewriter was introduced in 1924, and most surviving machines originate from either Dayton, Ohio, or Pittsburgh, Pennsylvania, two places the company held operations. Ted Munk lists seven machines in this blog post, and I mention an eighth machine here.
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