For Gotland style sheaths then this cheap CD is a must :- http://www.arkeodok....%20example.html. If you click the link you'll see a couple of examples of finds but the CD is well worth the money. Googling 'Gotland knife sheath' will bring up a few other examples, with these by Thorkil being some of the best examples:- http://www.thorkil.pl/knives.htm
Beyond that, I'd recommend getting hold of copies of the two books by Esther Cameron:-
http://www.oxbowbook.../Location/Oxbow
http://shop.museum.i...ds-sheaths.aspx
Ahhh, eventually a good re-enactor learns to challenge EVERYTHING and take nothing as a given. So many things that are common in early medieval re-enactment (like highly decorated viking sword scabbards) have no basis in reality and, when questioned on a p iece of kit, most re-enactors have no idea what it's based on. They just accept it as being correct because generations of previous re-enactors have done the same. I like to know where everything comes from, how it was made, what materials it was made from etc... I started out in Regia about 20 years ago (and was a member for 8 years)and it's a good place to start, with very high standards of authenticity.
Fortunately, i don't. I get to pick and choose my projects based on how interesting they are and how interested the customer is in having something more authentic than the majority of scabbards and sheaths on the market. I don't do it to make a living, which is just as well because nobody would be prepared to pay what these things cost in terms of time and effort.
Like this scabbard I've just finished for the chap who portrays King Raedwald at Sutton Hoo. It's still got to have all of the gold and garnet fittings put on it but it's probably the closest thing to an truly authentic scabbard I've made to date. The wooden core is made from 2mm thick lathes of poplar curved to fit the blade. It's lined with beaver fur and the leather is dyed with kermes, wood ash and water which has been sealed with a mix of oil and beeswax. The decoration is both foundation moulded over cord or leather and then carved, taken from a design found on the 7th century Vaslgarde 6 scabbard.