Alvin,
The circle-B under the barrel is a characteristic of 1906 Lugers found sporadically between sn44409 and sn46920. All those reported but one (a Swiss commercial) are American Eagles.
Between 1907 and 1911 DWM produced 5,000 1906 pistols for the Brazilian army. These pistols are marked with an encircled B on the left receiver and underneath the barrel. It is strongly speculated that the markings on the barrel are inspection marks, and DWM used extra Brazilian-inspected barrels to assemble some of their commercial guns.
Threre is precedent for this with two serial ranges of model 1900 guns using Swiss marked barrels.
--Dwight
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