Record Club vs. Store purchased records

Good info, Elizabeth.. I can remember playing some record club pop/rock pressings way back when I had crappy gear and could tell the pressings were lower grade then! I would say, trash all the columbia club pressings of pop/rock and try to find used on ebay or record store original 1st pressings if you can find them.

no difference in quality

I was a member of those clubs during the 70's and 80's. I received the same quality vinyl the stores carried with the same packaging. I found the Columbia club pressings and the Book of the Month Club pressings to be better than some of the other pressings. But during the 80's disco era the vinyl was thinner physically on almost all labels than in the 60's or 70's.
The import labels were thicker and quieter during the 80's. The Japanese labels were almost always better during this time. Allot of the late 70's, 80's and 90's rock, soul and jazz was done on floppy (dyna-flop type) vinyl. And may digital recordings were in the mix then as well. I guess what I'm trying to say is that quality went down tremendously during the 80's and 90's in all genre's.
These same records were printed in the millions of copies and quality did vary from run to run.

Try to find random copies of some of your vinyl and see if the quality is better. For instance Dire Straits Love over Gold. I have it on Germany, USA and another country which I can't remember right now. The Europen copies were very very good compared to some of the American copies.

I am old and used to get the Columbia House record club records in the 60's under various names and throw away the bills when they came.My sister taught me that and i later returned the favor by bailing her out of jail for selling pot.The Columbia stuff was mostly pressed at the Tere Haute plant and that is the address the CRC used and this was one,if not THE major pressing plants for Columbia records.They also ran a huge plant in Santa Maria,California.The real question is where in the pressing master stamper,were these records pressed? If the master stamper was set for 10,000 pressings,typical of major labels,then the pressings would be the same.My sense of it is these record club copies were pressed after the commercial release so they would be later in the stampers life.So not as bright and great sounding as the earlier stamped pressing runs-usually ordered at about 1,000 at a time for a major label at that time.Then again,with a big hit the record club copies could be from the first thousand of a NEW stamper....? What is not certain is the premium grade of vinyl for the actual pressing,they might have skimped a little here,but i do know they printed separate labels and amended jacket graphics for the record clubs..
The Columbia record club,when finally discontinued became,"Columbia Special Products" and they lasted long into the final hurrah of the original vinyl age.There may be some stamper master reference number in the dead wax that might answer this question but it has got to be untraceable at this point in time.This information might be uncovered in the distant future by another civilization at an ancient dumpsite in Indiana.By that time we will all be swirling ether.I used to love to look at those record club ads in the magazines,how else could a 14 year old boy end up with Monk,Miles,Billie and Duke?