Lovely Norblin Art Nouveau forks flatware cutlery

Hello, I bought these recently at an auction among a whole heap of Kitchenalia items, bought for just one item, and have decided I like them quite a lot and wondered if anyone can tell me anything about Norblist (the manufacturer) or the two marks after the name: KA + BM (the A of KA is underscored by a line).
As you can see from the photos one of the forks has been cleaned rather vigorously, so I sort of hope that the above marks aren't hallmarks!
It's quite nice to own and use a fine old set of art Nouveau cutlery I think, although I may still sell them on ebay perhaps so would love any info you can give me about them.
I should add that I have tried to research this on line already but didn't turn up much info, I'm not just being lazy!!
Thanks a lot,
Ben
* Thanks to Efesgirl for info.