Singer buttonholer 1948 vintage Made in usa sewing buttons. Original case, instructions, and parts.
Beautiful, perfect and easy! ‘Sew’ easy in fact, it’s practically hands-free! Believe me, this buttonholer is still preferred by long-time sewists, even over the fancy, expensive machines with built-in buttonhole features. It’s amazing how the technology of yesterday still holds true all these decades later.
Here is a great video link to explain it's operation: https://youtu.be/7mwN7j9g4xw