I Am not a German cutler from 1870, but know they could do such thing.
Perhaps One can deep etch the "floral work" to give depth, then lighty polish to leave the "floral etch" but smothing out the steel laminations?
As I say Ive seen such work before, but Cutlers then were very skilled, I am just an amater hobbyist.
I to would like to know how such work was done!..... Perhaps Bernard Levine on Bladeforums would know? or one of the foromites there? several are Germans with great knowledge of there old cutlers.
Spiral
PS. I think it is against forum rules to post in other languages than English ?: Or perhaps Ive misunderstood that? It seems more common now than a few years ago perhaps the rules have changed?