So you've obviously found the version on Discogs
With that in mind and you can match the matrix numbers/markings then you can say you have an early
version. A1/B1 will nearly always be the 1st pressing, then you get into a whole world of pain around mothers and stampers as is alluded to above.
Start from the top of the Discogs entry and check the images to see if they match yours, check the label/catalogue number, check the notes section - things like the mention of cardboard thickness etc.
Remember, in the 60s/70s, vinyl records were pumped out in their millions and many versions of what looked to be the same thing will have been produced - that's why there are 266 versions of that album worldwide!
And as has also been mentioned, all this is only of relevance if you are trying to sell it on. If you are listening to it and keeping it, how it actually sounds is more important!