I have been given a lot (many thousand) hooks by a retired salmon fly tyer. Most are all in little tan cardboard boxes with Mustad paper stick-on labels containing a picture of a key, words 'Key Brand' above and below the key, and red-stamped words Mustad-Viking Hooks. The hooks themselves are wrapped in waxed paper inside the boxes. I can find some some of the hook numbers on the Mustad website, but some numbers and hook shapes leave me puzzled.

What might be the approximate vintage of these hooks? Would they compare favorably with new hooks in brittleness, sharpness and such? Will I be at a disadvantage using them to tie flies, I.e. is there a practical difference between a new, say, 3906 and one of these? Is there a link that might help me identify some of these tghat I can't find on the current Mustad website?