"Is it possible to get a more accurate date?"
This Luger is properly designated New Model Parabellum, of the standard commercial Parabellum category; this model began production in 1906. It is the American Eagle variation.
The Pistole 1908 (P08) commercial model began production in 1909, serial number approximately sn 39063. Production of the commercial P08 is intermixed with the New Model Parabellum, which ceased production in 1913. The DWM commercial proof mark changed from the crown/B,U,G suite of markings to the lazy crown/N marking in 1912,as early as sn 51000. This dates your Luger between 1909 and 1912, there is not a way to pin it down further.
"What does the B with the circle around it on the barrel stand for?"
Conventional Wisdom ascribes the encircled-B on the barrel as leftover or overrun barrels accepted for the Brazilian Luger military contract. Brazilian Lugers do not actually have this stamping on their barrels which leaves this as unconfirmed speculation, subject to future factual discovery.
"What does the "3" directly in front of the trigger stand for?????"
This is not a known standard marking on this (or any) model Luger pistol. Any attempt at explanation would be sheer guesswork.
--Dwight
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