Antique Victorian Silver Book Chain Necklace, Victorian Collar, Star Links

This beautiful lightweight necklace is not hallmarked but was sold to me as silver by an Antique dealer. It consists of ornate star punched links and the smaller links are plain on the reverse (they measure 7mm x 8mm and the larger links, 9mm x 12mm approximately). The total length is 44.5cm (including the clasp) and it weighs 17.7g on my scales. It is in its original, uncleaned condition and there are signs of wear in keeping with its age - several dings to some links and one small circular section of the larger links is missing - please see photographs, thank you.