Pandora 925 Sterling Silver Black and Grey Zig Zag Bracelet Charm

This retired sterling silver Pandora charm features black Murano glass with grey zigzag detailing. It is stamped '925 ALE' on one side but also has two small square stamps to the left of the 925 (which most similar charms do not have). The one looks like an anchor (?) and the other looks like an eagle with a tiny 925 below it. This charm was made pre-2011, which is when Pandora started stamping "S925" instead of just "925". I could not find the significance of the other stamps. There is some minor discolouration around the metal on the PANDORA side. Weight: 2.89g Dimensions: 14mm x 14mm x 8mm