I'm sure we've discussed this badge before - and not that long ago.
This was also sold under the badge "Bartlett" but that was the reseller name, and I don't remember who made it . . . so if you search that, you'll find an assortment of machines with that name on them, and a few will be identical to yours except the name (including decals).
I kept thinking it's National - and after reviewing older threads I remembered why I thought that LOL!!
Did find this thread -
http://www.quiltingboard.com/vintage-antique-machine-enthusiasts-f22/bartlett-treadle-need-home-t264482.html
and another - this has a picture farther down (page 3) that shows the Bartlett with the same basic decals
http://www.quiltingboard.com/vintage-antique-machine-enthusiasts-f22/search-information-my-treadle-t255650-3.html