Nowhere in that article does it say who removed one of the stamps to reduce the number to 15.
Am I misunderstanding something?
MDI booklets made from sheet stamps
were hand-assembled by tearing sheet
stamps into blocks of 15 and using a spot of
glue to attach the intact block to the back
Other "blue" booklets contain self-adhesive
stamps. These booklets were made using
stamps, including the backing paper, taken
from printed web sections that were
originally intended to be processed into
convertible booklets of 20 stamps [plus a "reorder" label]. The three stamp printers used specially designed die cut mats to score out panes of
14, 15, or 16 stamps which were then glued into the blue booklet covers.