Dear forumites
My name is Ny Björn Gustafsson. I'm an archaeologist (Swedish btw) currently working with an academic paper on slave trade in the Viking Age. As some of you probably know there are at least two historically accorded references to slave chains being used by Scandinavians at that time. In the course of my work as a finds specialist I have found several potential slave chains from the rather well-known emporium Birka at the island Björkö, Sweden (or rather re-found - they were excavated long ago...). Birka fell into declined and was let down in around 1000 AD.
I include links to photos of two of the finds (click the photos to enlarge):
Neck iron, found in 1872:
http://www.historiska.se/data/?bild=324769
Manacle, found in 1928:
http://www.historiska.se/data/?bild=300430
Now I would like to ask you for help in finding references for a more modern use of fetters, manacles aso of this general type. From what I have been able to find via the Internet there are some pretty late examples from the Americas (18th & 19th C). If possible I need a published account (I'm not being lippy here, just minding intersubjective verifiability...) - a book illustration or something similar.
I greatly appreciate all help I can get - Swedish libraries don't generally hold literature on such narrow subjects you see.
Best regards
/Ny Björn Gustafsson
Stockholm