I don't know if there's much difference in authenticity between the examples given by Colonel Poo and the likes of The Stranglers, Vibrators etc who 'went punk' in 76. In all cases the records were made because punk happened and so they're....punk.
1. They went punk (e.g. Vibrators)
2. They were never punk, and in fact probably hated punk, and did a punk piss-take (e.g. Norman and The Hooligans 'I Hate Punk', Ritchie Hale and The Stormers 'Punkski')
3. They'd been around for years and just changed enough to be included broadly as punk (Fabulous Poodles, Radio Stars etc). But they weren't really punk.
4. They did a one-off record in the punk style, but were really trad-rock or prog or something (can't think of a great example apart from Public Zone's 'So Naive', or maybe The Monks 'Nice Legs Shame About The Face'?)
― Dr.C, Monday, 4 June 2007 11:50 (sixteen years ago) link