Hartmann & Weiss GmbH (H&W) is a Hamburg-based custom sporting firearms maker founded in 1965.

They have produced small numbers of double rifles, in calibers from .375 H&H to the .600 Nitro Express.

Five years later he relocated to Hamburg to work with Gerhard Hartmann as a custom gunsmith.

Three years later, an associate named Peter Nelson established a second location in England.

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