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The London Literary Gazette and Journal of Belles Lettres, Arts, Sciences, etc. for the year 1825 (page 827), describes a pantochronometer produced by Mr. Charles Essex. See the link below.
The Registry of Arts and Sciences, published by Cowie and Co. dated 1826, describes the Pantochronometer as sold by Essex & Co.
These are the earliest record of this device that I could locate, described as a combination "compass, sun dial, and universal time dial..." There are also listing for versions of this device in antique catalogs. You may be able to contact such an antique dealer to see what information may be on the devices themselves.
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