Congratulations on your new addition. What wonderful children you have. They really tuned into what Mom wanted! If you have blue on the medallion it is likely a Centennial. The other
Centennial that I know of was from Texas State Fair. That would have a band of Red on the medallion and it does say State Fair of Texas.
I found a wonderful book with so much information. Its written by Nancy Johnson-Srebro "Featherweight 221 The Perfect Portable and Its Stitches Across History."
I couldn't stop with one and now have five in my sewing room. They travel well and are used alot! Probably more than my Bernina!! They are sooo sweet and a good machine. Congratulations! Enjoy using it.