The hallmark appears to me to be D(hammer)A. An auction house expert suggested David Andersen but your list of marks does not have one like this. I've also seen similar silver items on e-bay etc. as DTA. The two very small marks in the center appear to be an elongated open circle and the other a 5-pointed star.
ATLA has been ID'd on a silver replacement site as the pattern name (although their picture was a very plain hammered flatware pattern). They listed the maker as Raavad. Radvaad is now owned by Fiskars and their site lists only cutlery. Is ATLA a pattern or something else like EPS?
ENERET is also listed as a maker but since googling it brings up a gazillion European law firms specializing in enerets, I'm guessing it just means registered, as a Danish/English dictionary says. Am I correct on this?
Thank you.

