Note: on my website many of the
pictures can not be seen! They are of course present in the cd's;
contact me if you want to purchase them: evert@klaseboer.com.
J.H.Behrmann was a stamp forger or forgery distributor of Hamburg (Germany). I don't have much information about him and I'm not even 100% sure that the next forgeries are actually his......
The book 'Roman States Forgeries The issue of 1852' by F.J.Levitsky also mentions several Behrmann forgeries of the Roman States.
The following text can be found at: http://www.fipliterature.org/translations/pt043.PDF
For example, one very well respected firm in Hamburg, that of
J. H. Behrmann sent bulk imitations of even the simplest stamps,
such as those of Hamburg itself, Tuscany, Hanover, etc. out into
the world.
Last image obtained from http://www.gsu.edu/~libpjr/stamps.html.
Possibly a Fournier product cancelled with a pattern of lines
with a very thick line in the center. Other sources say that
these forgeries were made by J.H.Behrmann (a stamp forger of the
1860-1870's from Hamburg). Next to it two similar forgeries from
Grenada, Natal and Queensland.