Who created "Self-Portrait (?) with Plumed Cap and Lowered Sabre"?

Self-Portrait (?) with Plumed Cap and Lowered Sabre was created by Rembrandt van Rijn in 1634.

What medium is "Self-Portrait (?) with Plumed Cap and Lowered Sabre"?

Self-Portrait (?) with Plumed Cap and Lowered Sabre is etching.

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Rembrandt van Rijn, 1634