Ho Hillary,
 
I've been searching many ways for your horn! Interesting topic.
 
The best I found are photos online by the Library  of Congress American 
Memory project
_http://www.loc.gov/fedsearch/records.tkl?cclquery=slave+horn%20&start=1&id=ta
rget-ppoc.tkl&targets%5B%5D=ppoc&targets%5B%5D=recommend&alltargets=targets%5B
%5D~ppoc|targets%5B%5D~webpages|targets%5B%5D~recommend_ 
(http://www.loc.gov/fedsearch/records.tkl?cclquery=slave+horn%20&start=1&id=target-ppoc.tkl&targets
[]=ppoc&targets[]=recommend&alltargets=targets[]~ppoc|targets[]~webpages|targe
ts[]~recommend) |
 
Found by a web search using the terms
slave  horn              or     "cow horn"  slave
 
Perhaps on online inquiry to the Library of Congress reference staff might  
help  too.                 Best wishes, Barbara Hass, retired  librarian
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