This was the first compilation album to be released by The Wurzels. The main release was in June 1979 as a 12" vinyl stereo LP. The album was simultaneously released in this cassette tape format on the EMI Encore label, catalogue number TC-ONCR 523
This design of cassette shell was introduced in early 1977 and was produced in both grey (as above) and cream coloured plastic. The text was printed directly onto the cassette body in blue (as in this image), red or black ink. As can be seen on the images the tape was produced with the Dolby noise reduction system to improve the quality of the sound when played on suitable players (noticeably to reduce the hiss associated with tape playback). Cassette cases were used with clear fronts and black bodies with a lightly mottled effect on the back face.
This particular album release appears to be only found with blue text on the grey shell.
This style of cassette case insert was introduced by EMI in early 1977. It was printed by Garrod & Lofthouse (who also produced the vinyl album sleeve) in June 1979 as indicated by the line 7906 G&L.
Unlike the LP sleeve for this album there were no sleeve notes on this cassette insert and song credits were abbreviated to surnames only.
Beneath the catalogue number TC-ONCR 523 appears another code number OC 254-07 035. Between 1969 and 1982 EMI had an international coding system which they hoped would get adopted industry wide, and they used it worldwide for their own releases. In fact, the numbers used formed the basis of the 7-digit numbers adopted in 1983 and inserted into EAN/UPC barcode-based cataloguing, used to this day.