It depends on what your collection goals and ideals are. At that particular time. Collection wants change over time. Collection purposes change. There are "I like to have these" collections, and then there are "I need these for..." collections/accumulations.
For myself, my folders are a few users. I don't collect them, other than to have multiples of the ones I like to use ::
- Buck 110s, the first knife I bought for myself around 1969 or 1970; still carrying the same one on my EMS gear belt 46 years later and have a couple of spares
- Kabar rigging knife from the 1950s/1960s, my LFP EDC. I have 7 or 8 of them.
- Buck 501 / Buck 48X make up my small RFP EDC folders
For a fixed blade collection, I think every such assemblage should have::
- USMC 1219C2 / USN-MK2 (or both)
- USN MK1
- Western W49 Bowie
- several US bayonets of various models
For a "utility blade" collection::
- WW2 USMC Bolo
- WW1 M1917 Bolo
- pre-WW1 Springfield M1909 Engineer's Bolo
- Collins #1005 Engineer's machete
Any "throwing hawk/axe/hatchet" sets should include at least 3 each of 1 or more of the following::
For competition - these all come w/ 22" handles that can be cut down to 13" or so...
- Cold Steel Norse Hawks
- Cold Steel Frontier Hawks
- Cold Steel Trail Hawks
- Cold Steel Rifleman's Hawks
- Vaughan Lath Hatchets (come w/ 13" handles)
For camp throwing or SHTF hunting axes, add in
- Condor Double Bit Throwing Axes
- Estwing Double Bit Axes
For SHTF hunting purposes, I really like the Condor Double Bits. No leather to rot, no wood handles to break, pommel that can be sharpened. I plant 6x6 and 4x4 posts in the ground sticking 4 or 5 inches out of the ground to simulate rabbits and squirrels and practice throwing at the stubby posts from various distances. Quieter and cheaper than bullets for taking out rabbits or grounded squirrels (Or possums and raccoons if the pickings are lean

) for diet supplementation. You just need to paint them bright yellow or orange so they can be found in tall grass more easily.
ETA:: That's the axes that you paint, not the critters.

