Since the text on the HMV side is too small I've typed it below.
"The world's greatest pianists, violinists, opera and concert stars, orchestras and conductors are waiting to entertain you on "His Master's Voice".
The great achievement of electrical recording has extended the scope of what may be reproduced. To the imposing array of the delights of the gramophone are now added the Grand Organ, notable Choirs, records of actual performances in famous Catherals and other public buildings.
Whether your taste in music be serious or gay (Does that mean that jazz music loves have a gay taste in music?

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"The new HMV Gramophone with the re-entrant tone chamber represents an immense advancement in the science of sound reproduction. Sound box, tone arm and tone chamber are all entirely new in design. The prinsiple of "Matched Impedance" (by which an unobstructed pathway is made for the sound waves after they leave the diaphragm of the sound box) is applied throughout. It is the only gramophone so constructed
It sounds to me as though they were trying to wow the buyers with big words that sound good!

Finally, the last one is a mystery. Anyone ever heard of Gillett as a record company?