Glass Inkwell. Black and clear glass. Celluloid and blown glass. The thick glass base of this inkwell has a starburst pattern on its bottom, a stepped interior and a threaded rim. The black plastic top has a dome with a hole in its center. The black top is marked,"SENGBUSCH SELF CLOSING INKSTAND CO. MILWAUKEE WIS. PAT. APR. 21 03. AUG. 23 04. JAN. 15 07."