I was thinking about leaving my comment as "!!!!"
Then I saw the reference to the Dulite line. I thought that was only a 1930's name. Are those the big ones?
Cow tail is a name some people use for biscuits and red eye gravy.
For example: http://www.ebay.com/itm/141216212349
versus http://www.ebay.ca/itm/131143194158
.... I just typed "interesting" after your post with the modified Akro box.
Now I see you say it here. I don't know enough about micas to know what that might mean on this one.