Vox Phantom guitar strings
Phantom strings came into the Vox catalogue in 1962. Below, a complete set of roundwounds from late 1964 or early 1965 - the printer's runner on the second of the two paper inserts bears the date September '64. Jennings also produced Phantom tapewounds.
The date 9-64 in the printer's runner.
Page from the Vox catalogue of February 1964.
Detail from the Vox "Precision in Sound" newspaper format catalogue. Note that the packet of strings depicted has "VOX" in old style square letter form.