Batman pin 1966

[mark]

Please excuse me for posting something like this but maybe someone here may know ...

 

I came across and bought an unopened Batman & Robin Society Charter Member 3" button from 1966. Everything is in real nice shape.

 

I don't know much bout vintage Batman stuff but thought it was pretty unique as its remained unopened and nice after all those years.

 

 

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...&category=35767

 

This is what it looks like but mine is in original package.

 

Anyone know what mine may be worth?