100 Euro Innovations of Slavoljub Penkala

Slavoljub Eduard Penkala was a Dutch-born engineer who settled in Zagreb in the 1890s and became one of Croatia's most celebrated inventors. In 1906 he patented a mechanical pencil and, in the same year, a hard-tipped fountain pen — the word "pen-kala" eventually lending his surname to the Croatian word for pencil. His Zagreb factory, founded with entrepreneur Edmund Moster in 1911, was among the first industrialized writing-instrument manufacturers in Europe.

The .9999 fineness places this among the purest gold issues in the Croatian commemorative program.