There are a few mentions of Julius HETTICH in newspapers, in Cardiff that I can see, but none relating to St Helier.
It appears there are also some of his son Edwin in St Helier, in British Newpsaper Archive - I don't subscribe but you can search for free. It appears from the snips available that Edwin ran the business, and passed an exam in June 1908 by the British Optical Association and conducted eye exams as an optician.
Also a marriage notice for Emily Florence, second daughter of J HETTICH, Queen St ... to Clarence HAMON, third son of C W HAMON of Jersey on 9 June 1908.
Modified to add:
Also a wonderful description of a sign above his shop in 1909 (I've cobbled together a transcription from previews)
"A very large and striking sign has been hung outside the premises of Mr. E. Wyndham Hettich, jeweller and optician, 1, King street, and has attracted much attention, particularly in the evening. It is in the shape of a pair of gilt spectacles, with translucent lenses, below which a scroll bearing the words "Sight-testing optician,” the whole being suspended from a handsome iron bracket. At night, the lenses are illuminated by two 25 candle-power electrics lamps, which are controlled by a flasher which causes the eyes ” to shine and darken every [?] seconds. The flashes can be plainly seen at a considerable distance, and from the prominent position of the s, attract much attention after dark. Made on the design drawn up by Mr. E. Wyndham Hettich, who is to be complimented on the very appropriate sign which now adorns his establishment it is pleasing to learn that the work has been carried out entirely by local firms, in a very creditable manner. The iron bracket from which the sign hangs was supplied by Mr. Ph. Feuvrp, Don-street, the spectacles were made the firm of J. W. Dupre and Co., Charing Cross, and the gilding was entrusted to Messrs. Anderson and Son, Waterloo-street. while the connecting flashing apparatus the electric installation used on the premises, was carried out by Messrs. Hodgetts and Le Maistre, Bath-street. may not be out of place to remind those of our readers who have failing sight that Mr. Hettich makes a specialty of up-to-date and scientific sight-testing, while those to whom the idea of wearing glasses is obnoxious from considerations of experience, the Fairy eye-glasses, light, comfortable and almost invisible ..."
Jersey Independent and Daily Telegraph, Saturday 01 May 1909
