The black labels came in late 1970 and any earlier releases bearing them are in fact repressings. This single, like most of Liberty's other big sellers, was pressed by several other companies on contract to meet demand. A proper expert could tell you which plant from the vinyl thickness, centres, etc. Pye did quite a bit at their Mitcham plant, EMI at Hayes, and Decca did some too. The RRG has a fair bit of info on this in the Beatles listings.