I sent a email to S. Africa asking the providence of this knife and this is there reply, which is cool as this is a original by Arno SR which may make it worth a little more, I paid $200 for it without any knowledge of the maker just cause I liked the feel and shape, I originally thought it was walrus tusk scales turned out to be warthog Ivory, Arno Bernard knives are made from Bohler N690:
Based on the logo and the shape, I estimate that this knife was built approximately 10+ years ago by Arno Bernard Sr. before he joined with his sons under the current logo.
It falls in the Grazer Series and looks like a forerunner of the current Springbok design. http://arnobernard.com/product-category/grazer/springbok/
I can send you a Cape Buffalo Sheath that should fit that particular model for $50 ($40 for the sheath plus $10 shipping). If you are interested in purchasing a sheath, I will send you a paypal request.