24.5 mm diameter, 13.5 g, 92.5% silver, flat edge denomination "10 LEI", year 2004	inside an inner linear circle a pine marten in its habitat, circular inscription · CARTEA ROŞIE · JDER - DE - PĂDURE · MARTES MARTES meaning "RED BOOK PINE MARTEN" (the scientific name being written with cursive capital letters) Issuing date: 23th of August 2004 Maximum mintage: 500 coins

The Red Book series comprises the following 10 lei silver coins (until January 2013): wildcat and green woodpecker in 2001, black stork and European mink in 2003, pine marten in 2004, imperial eagle in 2005, great bustard in 2006, European ground squirrel in 2007 and white waterlily in 2008. In 2011 the series was enriched with a 50 lei coin with the Eurasian spoonbill and in 2012 with two other pieces - otter and lady's slipper.