This is possibly the earliest extant, unmodified No. 3. There is one featured at Type Oh's blog that has a lower serial number (20007, see link), but that typewriter displays a number of modifications.
On my machine, the ser. no. is 20226. A secondary number, etched on the underside of the carriage (common on these machines), is 11006, which I gather from Ed Neuert's article in ETCetera (Nos. 106 & 107, Fall/Winter 2014-2015), is the lowest to be found on a No. 3.
My machine has early features: no pigeon logo on paper table, shorter space bar, pivot bar segment, straight ribbon selector, etc.
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