Mark B. Ledenbach's vintage Halloween collectibles blog.

vintage Halloween Black Cats diecut fence conecting centerpiece & Cat Stand Up

These items were all produced by Whitney of Worcester, Massachusetts. Four singing black cat sections comprise a full set. These would link together to form a rectangular shaped table centerpiece. You can see this and other four-sided table centerpieces by Whitney on pages 274-275 of my newly published reference. 

10/10 Update: The buyer did not make a good buy, paying $239.50 for an incomplete singing cat fence centerpiece.