When looking at an Atlantic or one of it's subsidiary LP labels to find it's origin, it's easily shown near the bottom of the record label that will read something like, ST-A-693146-CT Here's what those letters and numbers stand for... ST: Stereo A: Atlantic...or C: Atco or CTN: Cotillion or AS:Asylum or NO:Nonesuch 69: Year master tape was finished 3146: Catalog number of master tape CT - Columbia, Terre Haute AR: Allied Record Company, Los Angeles, CA BW: Bestway Products, Moutainside, NJ CP: Columbia, Pittman, NJ CSM: Columbia, Santa Monica, CA CT: Columbia, Terre Haute, IN CTH: Columbia, Terre Haute, IN LY: Shelley Products, Huntington Station, NY MG: MGM, Pittman, NJ MO: Monarch, Los Angeles, CA PR: Presswell, Ancora, NJ RI: Phillips Recording Co, Richmond, IN SO: Sonic Recording, Holbrook, NJ SP: Specialty, Olymphant, PA Sources: Discogs, 45-Sleeves, Steve Hoffman Forums