Mystery Artifact of the Week!

Greetings! and welcome back to the Mystery Artifact of the Week. We missed sending you one last week because we had gazillions of schoolchildren at the museum last week (it was the last week of school don't you know). 

Speaking of schoolchildren, one of our brilliant charges asked what this was last week. We were hoping you might be able to tell us...

If you think you know we'll be glad to hear from you. Heck! We'll be glad to hear your theories regardless. Happy guessing.