Hello
Welcome to the forum with your question.
I’m inexperienced in Swedish marks and I haven’t any guide for Scandinavian marks.
I’ve looked here:
http://www.925-1000.com/Fsweden_Date_Code.html
If I interpret correct, than is in your example missing the »3 crown« state symbol for Sweden.
From left to right:
Fineness mark in letters »STERLING« = 925/1.000
Maybe town mark for King’s capital = Stockholm
Fineness mark = 925/1.000
Date mark »E10« = 1979 (= 10th cycle of Year letters)
Maybe maker’s mark »A3« or »AD«?
Let’s wait only a little while until the experts for Scandinavian objects getting notice of this; because you’ve placed your question totally wrong under »American after 1860«.
An advice of me: Take a little time before you place your quest — and make some search before e.g. in:
http://www.925-1000.com/foreign_marks.html
Kind regards silverport