If you could post a picture of the entire machine it would help. I did a quick search on the web, and it looks like your machine was made before 1900. The curvey base or fiddle base are most common before 1900 or at least world war one. There's a good chance your machine was made by White, but it's a wild guess from way too little info.
This is an 1890s Queen made by White. The base and stitch lenght adjuster looks the same as on yours. It needs a bit more research to confirm data.
