Ed, Pete:
The circle B marking caught my eye also. You are correct Pete that the Brazilian Lugers are 7.65mm. Up until now I have seen/heard about a number of American Eagle Lugers with the circle B marking and they all were 7.65mm guns, so I naturally assumed that the barrels were were over-runs on the Brazilian contract and DWM just used up the stock. This one in 9mm changes all that and points to an inspector using that die for an inspection/approval mark. As to what he was inspecting/approving is anybody's guess. Verrry interrresting.
Nice gun Ed. 9mm American Eagles are a tough gun to find. Glad you got one. Those are odd cuts on the grips. As Dwight noted, they look like they were made to accommodate an Ideal holster, but in their current configuration, they would not be adaptable to the metal grip backing. Another enigma!