Berta, I just showed mine too!! I'm having so much fun piecing on mine. Her name is Miss Kitty b/c she purrs :D
Have fun!!!
Linda, I'm a bit confused about my machine. It has an AH serial number which dates it to 1948 but the faceplate is the newer one. I'm wondering if it got switched.
I don't know when the buttonholers started. I need to do some research.