This Trio (originally opus 3) has the dedication ‘Prof. Karlu Steckerovi’, i.e. to Prof. Karel Stecker. The publication was in 1900 and is listed under nr. 29 in Novák’s Thematic and Biblographical Catalogue (Prague 1999).
The page www.vitezslavnovak.cz/tabulka.html seems to give 1892 for beginning and 1893 for likely ending of composition, suggesting (if I am interpreting correctly- my Czech language is nonexistent, which is probably the problem) date of first publication of the piece (this particular edition aside) no earlier than 1893. Eric 01:35, 12 October 2007 (EDT)