Since this discussion surfaced yesterday, I've done a web search on
"Selters" and came up with the following site, which may be of interest.
 
http://www.geo.uni-bonn.de/publications/journals/may/may93_jou.html
 
This site is the text of a journal article entitled, "Mineral Waters in the
Rhenish Massif" by Franz May, Stephan Hoernes, and Horst J. Neugebauer, Bonn
University.  The following quote is from the Introduction to their paper.
 
"The Rhenish Massif is part of the Variscan Mountain belt of central Europe.
Paleozoic greywacke and shale are the most common rock types in this area.
Folding,
faulting and metamorphosis of the sediments, mainly under anchimetamorphic,
locally
under greenshist facies conditions occured in the upper Carboniferous. In
late
Tertiary epirogenetic uplift of the Massif begun.  Quaternary alkali basaltic
volcanism and extensive tectonics indicate the present dynamic activity in
this
region.  Different mineral and thermal waters occur in numerous springs and
wells
of the massif and its vicinity.  Among them are such famous locations as
Selters and
Spa."
 
Just to complicate this discussion, I've just noticed that Switzer
(1974:13, 15,
Figs. 11, 12) reported 12 examples of a very similar stoneware bottle from
the Bertrand.
The mark on those bottles is a crowned lion with the word "AMSTERDAMISCHE".
 They are
capped with foil with the words "WYNAND FOCKINK" and "AMSTERDAM".  Switzer
describes
these bottles as "Amsterdam Ale".
 
Mike Jacobs
 
 
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Mike Jacobs - Archaeological Collections Curator
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