Hi Gaz
Like they say above, there's no need to worry, they're legit and there's more than just this one with the UK style grip round the label. I can't name them but i've definitely had or got other Silver Blue's with grips.
There were other US labels that tinkered with this in the 70's to methinks?
Maybe someone will know the reason why the yanks tried this?
I do agree though, they do look and feel funny and I normally replace them with 'proper' US style pressings if and when I ever get them!
Cheers
Steve