JA
JAS84 Yorkshire Look North (E.Yorks & Lincs)
I guess that's one of the first appearances of the purple endcaps. It should've still said Yorkshire Television of course, it's the next endcap after that which ditched the logo that changed it, and even then it was Granada Yorkshire. The regional name only completely went when the ITV Productions brand was introduced. There's another error on that endcap - no GR^N^D^ logo.