that MN A is most likely a Davis VS machine. Based on the tension type, this may be a later machine that takes "modern" size needles, but the shuttle and bobbins are only available vintage.
Sears sold machines under teh Minnesota name, and I think over the years, at least 5 different companies had contracts with Sears to supply them. And even the "A" got reused - but it's easy enough to tell who the manufacturer is by looking at the machine. One key item is the square needle plate and also how the belt rides. Though the front inspection plate on yours has me wondering - would need better pictures
Here are two of my Davis machines. I think they would both be older than yours.
It also has a top clamp foot, so you can't get something like a hopping foot for FMQ, and the feed dogs don't drop so you need a cover plate for FMQ.
It's a nice machine, and should sew well as a treadle or hand crank - not sure if it's got a way to mount a motor to it like Singers have. However I don't think I'd recommend this type of machine for FMQ.