I find a very good Naumburg - page - but there was no answer.
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Thank You Bahner.Bahner wrote:Hello, the crossed sword and key is the city mark of Striegau in the Silesia region of what used to be Germany. Maker IAL is documented there ca. 1872 - 1884. It is believed that this was a branch of Breslau based maker Lemor. Best wishes, Bahner