Older post but since no one replied, I'll give it a go.
I'm not familiar with Flint but American companies could buy imported movements and dials and case them for sale in the US. Anything important would have to say "made in XYZ". In many situations the movement is an ebauche or partially finished movement. The purchaser would put their own finishing touches on it.
Hamilton did this in the 1950's and 60's, even though they were the leading American brand. You'll see "SWISS" on every Hamilton Automatic, for example.
Swiss-made movements offered the ability to compete at a lower price point and other American brands were already using man Swiss grades (Benrus, Elgin, et al). Each American company had an import code that would be stamped on the movement.
Your watch is probably from the 1930s-'40's, based on the style, size and lack of shock jewels. That's about the extent of what I can offer you.
Thank you very much! I have thick wrist, so i can't wear it
i am very sad about this. I own one more watch, it's vintage seiko, and i would love to know it's value. Can you help me once more?