Thread Storage Tool
Whenever you visit an antique shop, prepare to lay eyes on weird items that don’t seem to serve any purpose. This person discovered an egg-shaped piece of wood that had a pull-off cap. When she pulled it off, it revealed a tiny honey-dipper-looking thing. The only identifying feature the OP could find was “BX LT,” which might’ve been complete gibberish.
At first, the OP thought that it might’ve been a broken Russian doll, but the internet informed her that it was an antique tool for storing threads. You could coil different threads around each level of the honey-dipper-like wand thingy.