1997 version
graphic symbol on the coupon for machine processing

• numbering - vertically on the left side, horizontally in the right bottom part; the series is marked by a capital letter of the alphabet and a two-digit number; the serial number has six digits; vertically the figures are of a single size; horizontally they increase in size from left to right
• printing techniques: numbering - letterpress printing, other - offset printing

1995 version

• smaller graphic symbol for machine processing; otherwise the same; for changes in protective elements see below

1993 version

• the graphic symbol for machine processing is missing; some texts differ; small changes in colours and ornaments, particularly in the background; for changes in protective elements see: reverse side - elements