Spotted this U-shaped tool with multiple metal blades in my grandmother’s baking bin. It has a wooden handle but looks like some kind of strange knuckles.

Vintage pastry blenders may exhibit a variety of designs, often reflecting the era in which they were made. Some might have intricately carved wooden handles or decorative metalwork, indicating a time when kitchen tools were crafted with more aesthetic consideration.
Older models might also differ in the number of blades, with some featuring as few as three or as many as seven. The spacing and curvature might vary, offering different blending experiences. These variations can tell a lot about the preferences and technological advances of the time they were produced.