John,
as far as I know RG stands for Renato Gamba, Italian importer of Luger in that period. Gamba was in charge of HSc production in Italy, under Mauser license. I guess that the Italian market was not able to manage the entire Luger production foreseen by Gamba and so Mauser sold these pistols in other markets, mainly USA. The Luger RG sold in Italy had the chamber stamped with the Renato Gamba logo, an eagle over RG.
Ciao
Mauro
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