Stamp 16:

 

Stamp 17:

 

Stamp 18:

The small vertical line on stamp 18 is sometimes removed by the perforations.

 

Stamp 19:

 

Stamp 20:

There are lithographic flaws on this stamp in common with those on stamp 5
(Row 1, stamp 5)
.

 

Use these links below to go to:

Overview of plating. Row 1 Row 2 Row 3 Row 5 Row 6