Sadly most of those brands i cant seem to find in Europe, importing them from the States will most likely be to costly. The one brand there that seems readily available is Osborn, any reason for a older one? seen allot of newer ones, the new ones not as good as the old?
I started off with a Utility knife Sadly i feel it just doesn't do a good job at it, had a few different ones but feel it doesn't cut nicely and i have to cut multiple times to get thru the leather. Currently using a knife that's not really made for leather work
http://www.adithiel.com/product/k_01d-damascus-steel-nomadic-knife/
However it does work quite well once sharpened right.
I'm currently doing mostly wallets, keyholders, belts, axe/knife sheaths and gun slings, mostly because that's things that peapol want around here, well that and trinkets like armbands and keyrings. However i try to make whatever i find inspiration to do, only way to learn is to do after all.