This version has blue upper stripe/line(text with RCA Stereo Dolby System).

SIAE

On inlay:
"This STEREO tape gives monaural reproduction when played on monaural equipment. This tape is mastered to Dolby "B" standards for noise reduction. Decrease treble response when playing on non Dolbyised equipment."

On (paper label) cassettes:
(P) 4/73 David Bowie
"Manufactured by RCA SPA, Rome, Italy
From Master Recordings Of RCA Records,
TM(s)(r) Marca(s) Registrada(s) Used By Authority Of RCA Corporation,.....
Made In Italy"

There are two different versions with the same catalogue number : RCA ‎– PK 2134
both with grey shell and orange labels one has Stereo Dolby System logo on cassette & jacket, the other only Stereo.