As Chrsitine says, additional photos would be useful.
As well as a full profile view, I would like to see two photos of the base - one as a straight-on view showing the whole base and the other as an angled view showing the way the central area looks.
I agree that the overall look of the pattern, and the canes and twist type, appears to be a regular, daily production Strathearn. And if the date of purchase was say, 1967, rather than 1957, it would tie up a bit better. But if 1957 is correct, the additional photos may show something that could be of academic importance (to me at least)!