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When we were in Brussels last weekend I saw a number of broadly similar pieces with names or initials in coloured glass, set above a frit ground, sometimes with additional decoration. One or two were obviously old pieces with poorer quality glass, remains of the pontil mark, and rather dull colours. Others looked like they came out of the kiln yesterday. I think this style has been in more or less continuous production in various parts of Europe for a century or more.
Most of the Pilkingtons weights I have seen have had glass with a distinct blue-green tinge, or were crystal clear. I suspect this example is Belgian / Alsace / Czech in origin.
Alan