I'm totally new to knife collecting, in general, but I have been collecting Fairbairn Sykes Fighting Knives (FSFK) and only WW2 period pieces; so I will say that my fav knives are:
1. 2nd Pattern FSFK which my late uncle was issued with in 1942.
2. Whitby Silver Serpent folder (my father bought it for me when I joined the Army many years ago, and although now illegal in the UK is used around the home a lot).
3. A small twin bladed pen-knife, no maker's marks, which is always in my pocket.