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This could be the smaller ELG or Eprouve(E) Liége(LG), which large or small, was a direct result of the St. Étienne Proof Rules. The ELG acceptance stamp was a direct result of the barrels being proved singularly and then joined. If after either proof effort, the barrel(s) could be sawn in 1/2 or stamped with a >>R<< and sent back to the maker for repair. The smaller encircled ELG stamp was purely for export only. Should the tubeset return to Liége, the double would return to the Proof Facility and receive the full regiment of marks and have a Large & Small ELG acceptance stamp. At the same exact time, Saint Remy had a very similar ESR - Eprouve Saint Remy stamp under the direction of Dieudonné Crul, but it was short lived for say a couple months.

So the Belgian stamps, along with the tubeset knitter initials of >>LE<< just note the platform left Ourth, Liége >>In the White<<. Maybe unless they considered it a >>Trade Gun<<????

Hochachtungsvoll,

Raimey
rse