The thickness of the vinyl depends on the pressing plant. I have a blue fade copy of Freedom Means by The Dells that isn't as rigid as my copy of The Heatin' System by Jack McDuff with the pink and yellow labels.
The company was briefly run by Marshall Chess, son of Leonard, in his position as vice-president between January and October 1969, and then as president, following its acquisition by GRT, before he went on to found Rolling Stones Records. In 1969, the Chess brothers sold the label to General Recorded Tape (GRT) for $6.5 million. In October 1969, Leonard Chess died and by 1972, the only part of Chess Records still operating in Chicago was the recording studio, Ter-Mar Studios.
Although Chess had produced many R&B number ones and major pop hits over the years, it was in 1972 that the label finally reached the top of the Billboard Hot 100 with Chuck Berry's "My Ding-A-Ling", a live recording from a concert in Manchester, England. However, this became the company's 'swansong' release. GRT had moved the label to New York City, operating it as a division of Janus Records. Under GRT, Chess effectively vanished as an important force in the recording industry. In August 1975, GRT sold what remained of Chess Records to New Jersey-based All Platinum Records.
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Case Solved, Thanks Guys!