Michael, if you can secure a copy, check pages 148 and 203 of Costanzo's World of Lugers. The "A" is actually a triangle, the "T" and "C" are inside it. According to Costanzo, this mark is the Russian Tula Arms factory rework symbol. It is usually located on the top of the barrel and not where you say you found your marking. Sure would be nice to have pictures.
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