flaws stamp 16
Stamp 16 - row 4 column 1.

flaws stamp 17
Stamp 17 - row 4 column 2.

flaws stamp 18
Stamp 18 - row 4 column 3.

flaws stamp 19
Stamp 19 - row 4 column 4.

flaws stamp 20
Stamp 20 - row 4 column 5.
There are lithographic flaws on this stamp in common with those on stamp 5
(Row 1, stamp 5).

Use the links below to go to plating in the following sources:

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