Vintage Sterling Silver Herringbone Necklace Marked 925 Italy 18 Inches Lobster Claw Clasp -- 16.7 grams
Marked on both ends 925 Sterling -- Also makers mark which looks like a star over stripes with a carat mark on the bottom pointing to the lowest point of the star.
For more research on Italian marks try:  http://www.925-1000.com/Fitalian_marks_01.html
Condition is consistent with age and moderate use.