The Baldwin & Miller D6 mark appears on silver pieces made by Baldwin & Miller, a 20th-century American silversmithing firm known for producing both sterling and silverplate items. This mark includes the company name along with the pattern or item code “D6,” which serves as a catalog reference for identifying the specific design or form. While many Baldwin & Miller pieces were silverplated, the presence of this mark helps trace production details and distinguish between various models. The D6 code is particularly useful for collectors seeking matching items or verifying authenticity. It serves as an important reference point in evaluating and identifying vintage silverware.