bass Aston "Family Man" Barrett
bass Boris Gardiner
drums Carlton Barrett
drums Michael Boo
flute Brad Osborne
guitar Alva "Reggie" Lewis
guitar Earl "Chinna" Smith
organ Glen Adams
organ Winston Wright
percussion Brad Osborne
percussion Lee Perry
percussion Noel "Scully" Simms
producer Brad Osborne
producer Lee Perry
Recorded At Blank Tape Studios
Recorded At The Black Ark
Edited At Bullwackies Studio
Recorded at: Black Ark Studio Ja. & Bob Blank Studio USA
Edited at Bullwakie's [sic] Studio

Tighten Up recorded at Dynamic Sounds (1968)
A Serious Joke aka Mean & Dangerous aka Sign Of The Times recorded at Randy's Studio 17 (1969)

Runouts are etched.
Matrix / Runout: LPCT 0114 A (Side A runout variant 1)
Matrix / Runout: LPCT 0114 B (Side B runout variant 1)
Matrix / Runout: LPCT 0014 A-X y DB (Side A runout variant 2)
Matrix / Runout: LPCT 0114 B (Side A runout variant 2)