How do you know when an LP is a first or early pressing?


Being relatively new to analog, there has been a steep learning curve.
The latest important bit of knowledge has pointed me to the codes stamped in the runout groves, the labels and the sale listings. The questions are how to read the codes, and what to look for on the label and on the sale listings? For instance, a friend guided to to the “pink label” British Island Records pressings. Believe these are all first pressings and the original British. I bought a couple including Emerson, Lake and Palmer’s first album. A pretty good used one cost me $25 which I understand is a good price. I would like to find and buy more of these early, or first, pressings. I understand their sound quality is normally, or frequently, excellent.
mglik
Here we go.... While there definitely is a big grain of truth to that, the bigger truth with vinyl is you just never know. There is a strong tendency for original early pressings to be better, but its really more like its the later and reissue pressings that are worse. In other words buying new original is no guarantee of exceptional sound quality.

If all you want to do is avoid the really bad stuff then you are on the right track. But if what you really want is the exceptionally good stuff then it is just the beginning. Because if you buy 20 identical copies and play them you will find no two sound exactly the same. Most will be very close (average), a few will have pretty obvious problems (sibilance, weak bass, etch, etc), and may be one will sound quite a bit better than any of the others.

I have records just like this. Never realized it until I started buying Better-records.com and compared their Hot Stampers with my identical copies. They look exactly the same, identical hot wax and everything, but they do not sound anything like the same. Hot Stampers are in a league of their own.

So you can filter like you’re talking. That all by itself is better than most ever figure out. Then you can compare copies and keep the best. Knowing its all down to random chance and you might do this with 10 or 20 or more to find a really good one. Or if you really just want the to die for sound and its worth it to you then buy a White Hot Stamper. Only then will you know what I’m talking about.

Then if you do please come back and let us know, as there are still a lot of skeptics who think I’m blowing smoke.
Discogs is your friend
https://www.discogs.com/

It's not 100% accurate for listing EVERY pressing, but still the best resource,so far.
SQ varies with every copy.

You can save some time here, but it you will pay for it.
https://better-records.com/

mglik, it can go either way. Although the masters may be better back in time popular records often got cut short in pressing quality. A good master with top notch modern pressing technique and premium vinyl can yield a superior result. This does not take into account that most popular records were not taken the best care of. I personally will not buy used vinyl. I have thousands of old records. I do not need any more. Some reprints are actually far superior to their original versions because the original masters were terrible. A good example of this is the early Roxy Music records. The 1/2 speed remastered versions are worlds better than the originals. Some of Frank Zappa's early catalog were mastered on second rate systems. Before he passed he remastered several of them with exceptional results. Far superior to the originals.