Found at my grandmother’s house — there are rotating discs inside with numbers printed on them. What are they?”

Score counters (for games)

But the design + numbering format strongly points to a needlework row counter.

💡 Bottom line

👉 It’s basically an old-school version of a digital counter—a wearable tool to keep track of numbers while knitting or crocheting, disguised as a beautiful brooch.

If you want, I can help estimate its age or value more precisely 👍