this illustrates the point I think that if you are faced with a cold non-photographic image - and you aren't lucky enough to have the right catalogue - you will sink into the mire. Experience is needed - by visiting museums - plus handling pieces, to get a feel for the colour, and intrinsic make up of the metal. Of course, it would be unfair to ask someone to date a piece simply from these pictures. There's nothing new under the sun, at least as far as design is concerned, and an intuitive knowledge becomes essential to try and see through later copies of earlier originals.
It would be very interesting to know the colour of the glass of this Fryer pitcher, as compared to the ealier pieces from Bakewell.