It's a Davis machine, and you'll have to figure out if it takes the long or short needles, Someone posted about looking at the casting underneath for an A9 or A10.
It will take the Davis shuttle and bobbins.
I don't know about attachments, but hopefully I will soon as my machine has made it to Iowa today. I'll be shocked if I don't already own some that fit LOL!!
Saw one chart that shows Davis put "Honeymoon" on both models L and M, L has the stitch length on the pillar and M has it on the base, so you have a model L.
It should be the same as the Minnesota C. And lots and lots of other names too - but the one sold by Sears is often the easiest to find reference to.