It's a brooch.
It's a magnetic pincushion.
I found this little thingie when I went to pick up my sewing machine from servicing a couple of weeks ago. The young Mennonite salesgirl was wearing one on the capelet of her dress, and of course the shop was selling them. It's handy, since I usually end up carrying my pin container from sewing machine to table, and leaving it in the wrong place. This would also work well on the sleeve I think.
In other news, all the blocks on the vintage reclamation project are sewn together, and I'm ready to take final measurements, do some math, audition some fabric for the inner borders, sew them on, and then start piecing the outer border. I hope it goes smoothly.
The weather is so beautiful here right now that it's hard to stay inside. I hope everyone else is enjoying spring too!