The pattern is a 2 Iron variant of Damas Rosen, with prominent ribband edge (straight) and rod-rod (wavy) welds, which was often acid etched. I can't tell for sure but the barrels may have been lightly "pickled" to enhance the pattern.

Marholdt Waffen-Lexikon

[Linked Image from photos.smugmug.com]

[Linked Image from photos.smugmug.com]

[Linked Image from photos.smugmug.com]