Batman: The Animated Series - "6" Pinback Badge (90s)

Curious badge, that we’ve had trouble finding info on. 
Seemingly, it might just be from a line of licensed party supplies, most likely from a themed birthday card. 

You could also combine it with another numbered badge, if they turn... 54, 56 etc (we only have 4, 5 and 6 in stock, at the time of writing). 
If you know any very old wizards, you could also combine all three of the numbers, we have in stock. 

Condition: Great