Canadian 3,7,10,11

Canada

3,7: R (round)

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

3:                                                       topside down

7:                                                      topside down

10,11: R (straight)

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

10:              DRG

11:              E.S. & A. Robinson (CANADA) LIMITED