Canadian 3,7,10,11

Canada

3,7: R (round)

• paper
  
• flat base 
• horizontal tab
• zigzag cut
• manufacturer on base:

          3:                                 upside-down                          

         7:                                  upside-down                     

10,11: R (straight)

• paper
  
• flat base 
• horizontal tab
• zigzag cut
• manufacturer on base:

          10:  

           11: