Double your dating or mystery method
Due to its lesser copper content it tends NOT to tarnish as much or a quickly.
of Providence RI, which is the listing ABOVE the mark on page 57 of Rainwater.Places like Egypt still today only use 830 silver I would just like to correct one point.Here in Egypt we have 900 silver and up (hallmarked) and thats the most common grade of silver we have here (this applies to gold too, we dont have 9 karat or 14 karat gold here. In silver jewelry you might find less grade depending on the design.submitted by Myrna in Tulsa I haven't seen this particular design before, so can't be sure, but the 'bird or animal with it's mouth open' could be the maker's mark for Auran Kultaseppa which is an eagle head with it's beak slightly ajar.
Otherwise, you're correct about the remaining hallmarks.
The left box of each row is for the mark, either a photograph or text indicating the name found on the piece.