There once was an American Sewing machine Company. The earlier ones used a very unique style shuttle, but I don't know if they stayed in business long enough to switch to a more conventional style.
This one does NOT look like anything I've seen before, the tension on the front and the stitch length lever (round thing on the pillar) are unique, so I think this is a genuine, late model American and not a badged machine made by someone else. I could be wrong - it's always fun when something "different" turns up and the search is on.
Do you have any paperwork with it?
I'd also love to see the shuttle and/or carrier. Since I've been cataloging attachments, I've found that there are certain measurements you can take that seem to be unique to most Mfg when they are top or round clamp feet (yours is top clamping).