The Gramophone Company struggled to keep up with demand during their first Christmas rush in 1898.
By Christmas 1899 many of the supply chain problems had been fixed and gramophones and discs were pouring into the market. Even the company’s advertising looks established. Here is an advert from that busy season:
Sound Of The Hound 
This advertisement is from late 1900, not 1899. It clearly went to press before December 10 1900, when ‘The Gramophone Co Ltd’ gave way to ‘The Gramophone & Typewriter Ltd’, but it lists the expanded range of models that were just starting to appear in November 1900, and therefore cannot be dated to 1899.