Did a bit of searching - Some are badged "the Bartlett" and later are Bartlett and Bartlett Rotary.
The interesting item - some of "The Bartlett" are the National "Seamstress" model, this is the one that looks a lot like a New Home on the outside. This machine has a top tension leaf. Then there is another that is very similar with a tension knob, but it has a wide throat plate like Free and Singer, however the attachments show they are not the style that fits Free or Singer. Interesting - will be looking forward to seeing pictures of yours.