Continental 5,6,7,11,19

USA

5:

• glossy paper
  
• flat base 
• thumbhole
• horizontal tab
• zigzag cut

6,11:

• paper
  
• flat base with special fold
  
• horizontal tab
• straight cut
• manufacturer on base:

            6:                                         upside-down, blue     

           11:                                      upside-down, black