The 100-kroon banknotes were printed in 1991 and 1992 by the British printing house Thomas De La Rue and Company Ltd.

Front

The front side of the 100-kroon banknote features LYDIA KOIDULA (1843–1886) – an Estonian poetess, playwright and one of the prominent figures of the national awakening movement in the 19^th century. Koidula was the founder of Estonian drama and theatre. She took part in organising the first Song Festival in 1869. Koidula was also a journalist but she is especially known as a romantic patriotic poetess. To the right of the portrait, a singing nightingale is presented. The nightingale represents Koidula’s most important collection of verses: “Emajõe Ööbik” (The Nightingale of the Emajõgi River).

Back

The back side of the banknote features stormy waves and a limestone cliff. Limestone is Estonia’s national stone. The Estonian limestone cliff is a unique natural formation. The North Estonian cliff runs from the cape of Pakri in the west to the town of Narva in the east. The highest point near the village of Ontika is 56 metres high.

In 1994, an additional series of 100-kroon banknotes was printed by the British printing house Thomas De La Rue and Company Ltd. The design of the banknotes remained similar to that of the 1991 and 1992 notes. Some advanced  security elements were added. The multi-coloured guilloche was replaced with an image of a simplified cornflower. To the left of the portrait, silver ink has been used. On the back side, the anti-copier line structure has been changed. Instead of the rosette, there is a greyish circle where a singing nightingale and the denomination “100” can be seen at an angle.

 In 1997, a need arose for new 100-kroon banknotes. The most up-to-date security elements were applied in the new series. Eesti Pank was the first in the world to incorporate in the series a security element which is visible only through a special lens. The main colour and design,also measures remained the same.The new series was printed by the German printing house Bundesdruckerei GmbH and was put into circulation on 30 April 1999.

Front

The portrait of Lydia Koidula is engraved and shifted to the left to make room for a 3-dimensional watermark depicting the portrait on the right hand side. Above the watermark, on the right there is a uniformly light watermark featuring denomination “100”. A vertical holographic foil stripe is placed on the left edge. If viewed at an angle, lions from the coat of arms in a “positive” and “negative” form alternate with the seal of Eesti Pank. The left border of the foil stripe displays micro-printed repeating text “EESTI PANK 100”. A security element for the visually impaired is in the lower-right corner.

 Back

Different from the earlier series, the serial numbers are on the back side. Furthermore, a few lines from Koidula's poem have been added.

In 2007, an additional series of 100-kroon banknotes was printed by the German printing house Giesecke & Devrient GmbH. The new series was put into circulation in January 2008. The colour, design and basic security elements are the same as on the 1999 series. Some security elements were changed. The security thread is wider and fluoresces blue under UV light. It has two darker edges visible from the front or back side. The UV fluorescent rectangle with the denomination number is placed on the back side (on the 1999 series the same element is on the front side). The Governor’s signature (Andres Lipstok) and the year (2007) on the front side are also different.

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