Someone else will stop by with more appropriate advice but I think a lot of it will be trial and error. As you read the threads you will find that cetain brands have had their good years, their bad years, their good management, their bad management, their good materials, their not so good materials. You will have to form your own opinions and you will eventually settle into knowing what you like and what you're comfortable paying for it.
Nicely said. I think that like collecting anything, the classic advice stands the test of time: "never buy anything you don't like".
It eases the sting if you paid too much and makes it all the more enjoyable if you came out ahead dollar wise. But if you really like the knife and you are comfortable with the amount you paid for it, you win any way you look at it.
Here locally in South Texas, there isn't much to be found as a bargain in a flea market, junk mall, or resale shop. The knife culture is so strong here that folks just don't get rid of them. They show up at estate sales, or so beat up you can't really tell what brand you are looking at.
Around here knives are passed down over and over, or gifted to someone that appreciates them. I am part of that tradition myself. I just got my grandfather's Barlow, one that was purchased somewhere in the late '20s. It is going nowhere, and in turn will be passed down.
However, those malls and markets aren't the only venues for me. With great care and caution I have bought some nice ones on the Bay, but a good catches are few and far between. But is fun for me to look at all the old knives, so I bid low, and if I get it great, if I don't, that's great too.
The good thing about collecting these days is that just about any type of information is available on the internet. This is a good thing, as there have been so many old traditional knife companies from Germany and America that have resurfaced in China after going out of business it is hard to keep count.
And apparently there is another fun thing going on with one of the old German traditional knife companies that went out of business long ago. According to more than a few sources on a dedicated pocketknife forum this company assembles the knives they sell in Germany from parts made in China. I have seen the boxes and they say "Solingen" and some are even stamped with that on the blade. Yet none claim they were actually
made in Solingen, Germany.
I found that out when looking up a really nice looking stockman patterned knife I liked from the company in question, but was surprised that no one was bidding it up. The answer was a few clicks away.
Good luck, and be careful!
Robert