It is very, very simple: All Augustin pistols had this Vienna proofmark. After 1866 these pistols with this proofmark have been sold as percussion pistols with the Augustin system to Liège gunmakers and dealers. After the reconversion to flintlocks they had to be proofed according the Belgian laws. So they got the "ELG" mark on the barrel. Quite simple, isn't it!
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