The patterns are printed and xeroxed flipped horizontally, then cut in stripes.

Xerox is chemically transferred by Trimar on common paper.

As result, the picture is flipped again, with a stamp effect.

Paper is cut and pressed in the button machine.

The first set:
T - Aachen BT
ç - Eurostile
X - Futura Light
M - Lubalin Graph Bold
§ - Helvetica
A - Garamond Bold
CA - Avant Garde
k - Clarendon Light