Perophone was the brand-name of Vernon Lockwood Manufacturing Co., City Rd, London, first used about 1910. They produced conventional, but often above quality British Gramophones. Known as Micro-Perophone Gramophones by 1927, probably called "Micro" after the Bettini Micro-Phonograph which was so called to indicate the minute acoustic details it was capable of producing.
Quelle

PEROPHONE NEEDLES - A Report by OUR EXPERT COMMITTEE

These needles are said to be made of chrome steel. They were supplied to us in three grades—medium, semi-fine and fine. The bodies of the two louder needles have the same diameter, 0.058 in., the only difference apparent between thern being in the forms of their tapered points. The fine needle is about half the diameter of the others, 0.029 in. The needles are all of the semi-permanent type ; it is claimed that they will easily play ten records each and that surface noise is not so evident with them as with other makes of steel needles.

On the whole, our opinion of these needles is a distinctly favourable one. A metlium needle chosen at random played twelve records before any appreciable deterioration was noticed in the quality of reproduction ; semi-fine and fine needles lasted for fourteen records. Tonally, the needles are quite successful and compare well with other makes, with quite a marked advantage in the matter of surface noise. The Perophone claim in this respect is well founded and this particular virtue of the needles should commend them tomow; gram ophiles

The manner in which the Perophone Needles are pointed is perhaps open to criticism. Close examination shows that the points are not rounded off in the usual way. They are deliberately left quite sharp. The makers claim that this is an advantage, but to leave a sharp point on a dead hard needle seems to us scarcely a wise procedure, particularly since we find that a good proportion of the points are bent over in the form of tiny hooks. It is, however, only fair to say that these little hooks wear off with extreme rapidity and the points shape themselves to the record groove in about six revolutions. Possibly the hooks cause more than normal wear to the first three or four turns of the groove, but this is, after all, a mmminor consideration, as each needle can be used ten or twelve times, and the deleterious action of the hook is limited to the first time of use.

A further slight criticism concerns the grading of the needles. We find only a slight difference in volume between the medium and semi-fine needles ; but a wide difference exists between the semi-fine and fine. It would be preferable for the semi-fine needle to be modified to give rather less volume and fall more evenly between the other two needles. While on the subject of volume, it may be well to note that the Perophono Needles are not quite so loud as other steel needles of comparable grades. (Gramophone Magazine March 1929)