First pocket knife: SAK copy of low quality. Served for years, I bent the blade (!??), ruined some of the tools.
Few years later, I "borrowed" and lost my dad's great Henckels folder that had red plastic slabs and the size and pattern of the Buck 110 with excellent flat ground carbon steel blade. It slipped out of my pocket.
First fixed blade knife: Scandinavian pattern clip point and nice wood handle knife made in East Germany. Got it from mom at age of 13 as a reward for a championship medal. It served well until it was lost due to lack of any retention strap while playing "Cowboys and Indians" in the bushes. That knife taught me two things that I still keep: (1) no knife with smooth handle and without guard, (2) no leather sheath without retention straps.
Second fixed blade: dad bought a Solingen blade "dear sticker" that had an unbelievable thick blade and useless ground. Served well as a pry bar until met its match: an acatia tree branch. The butt end and the fancy handle stack became loose around the rat tail tang and I could never set them back nicely. New lessons learned: no tail tang, no fancy stack, no aluminum butt cap any more.
First real folder I bought: a Czech Mikov hunting folder with back lock, strong knife blade, saw and stag-like slabs. I carried that one through high school. It was eventually stolen in the army. (Typical story: four of us peeling potatoes, I jump up and leave for a second. When back, knife is gone and NOONE SAW ANYTHING! OK, my mistake..)
So I bought as soon as I could leave the garnison an inexpensive carbon blade folder sampler knife with celluloid handle that held up surprisingly well for the rest of my service time.
Since then, I am more successful in holding on to my blades. On the other hand, I do not use them that wildly any longer either.
HM