my opinion is that you're o.k. with this one - the shape of the label - the colour and the slightly spatter effect within the glass... and date wise I'd suggest between 1967 and possibly 1970. However, this still remains just my opinion - I'm a general collector only, don't specialize in anything.
There seems to be a percentage of early RSW material that doesn't surface, or only rarely, plus the usual one offs that occur with some of these makers - have a look in CH.
In his book 'Modern Glass' (1975), RSW was keen to show some of what was then quite novel and experimental colours and shapes that were coming from Scandinavia and Britain, and this general tendency to some shade of ochre/brown is not uncommon in many pieces from that period. Certainly King's Lynn used this colour, so it's not a case that it was unheard of from this factory.
Get the feeling that early King's Lynn glass is less collected than might be expected, not sure why, although there seems no end of folk who collect the animals.
Susan Tobin, in her book, comments on the fact that there were many different labels, in shape and colour, certainly there were oval shaped ones with wording similar to yours, so as we've said don't think the label is a problem, unless it's married to the wrong piece of glass of course.