Please post the pictures here if you'd like an opinion.
I did try to find the pics t post them here but it is a wrong link - no ics of an NSFK aluminium over there.
Sorry here it is.
All good this maker mark is always very lightly etched
a nice Original, Helbig is the only one who produced them in all alluminium, and as Sean said they etched very light.
OK, Thanks for all your help!