The Big Banger (26d) was released in 1972 and remained in the range until 1976 in the UK. It is always red and can have amber or blue windows, blue windows are marginally harder to find.
For the US market it was named Brown Sugar and Cosmic Blues, continuing in the range up to the crash of '83. Unsurprisingly Brown Sugar is brown but Cosmic Blues is white or blue. Of all of these Brown Sugar is hardest to find. To date I have managed to find neither.
