When the Alsace was still part of Germany, the tripoint between
Switzerland, Germany, and France was near the village of Pfetterhouse
(at that time probably called Pfetterhausen). The border marker,
dating from 1890, is still there, according to this web site:
http://www.multimania.com/pfetterhouse/village/village_borne.htm
It says here that it replaced an old Habsburg border stone.
Peter S.