From what I could (quickly) gather, Emitex was a British-based cleaning material used by Parlophone in the 60’s, then by EMI Records throughout the 70’s. It was also a prominent badge on all British-released Beatles albums, such as this reissue of PMC 1202, Please Please Me. Several variations of this classic stamp are found around the web, but little has been preserved about the Emitex material itself. With more time, I’ll dig a bit deeper.