Air Canada 1,8,9,16,18

Canada

Horizontal tab and coversheet

1,8: (PS 2051 up/star down)

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

                                    PS 2051 up/star down

          1: star upside-down

9,16,18: (star up/PS 2051 low)

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

                                    star up/PS 2051 down

             9: PS 2051    4 mm high

           18: PS 2051    5 mm high

           16: PS 2051    6 mm high & number 1 is different