Hi Coquet,
The case sponsor mark I.J.T.N belongs to Isaac Jabez Theo Newsome of 14 and 15, The Butts, Coventry. Newsome and Co 'Wholesale Watch Manufacturers' were one of the leading English watchmaking firms of the period, most of their output bearing the name of the retailer, as was the standard English practice. Newsome's mark was registered in November 1884. A sponsor mark indicates the person responsible to the assay office for the case and / or watch when submitted for hallmarking. It does not necessarily indicate the actual watch maker.
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