This is an astonishing result. This mechanical bat was produced by Beistle. It was sold in an envelope with a mechanical owl during the 1920s. (Beistle used at least two different colored envelopes. Some envelopes were tissue thin while others were of a medium-gauge card stock.) These bats typically bring about half of what this brought. I attribute it to the confluence of these factors: condition, the great photos, the clear description and the paucity of quality items on eBay right now.
Blog
Mark B. Ledenbach's vintage Halloween collectibles blog.