The brand name will be level three (BV3), which is the most populus level and values at 2/3 of BV2 and 1/2 of BV1 . You will also need to determine the Original Quality grade of the gun; there is a lot of difference between a best work SLE (OQ1)and a plain unengraved grade 3 SLNE (OQ6). Difference between OQ1 and OQ6 is about 4X.

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DDA