This vintage double albert chain is 9ct gold and has curb links with graduated size.  Each link is individually marked .375, which is the standard for 9ct gold.

The total length measures 410mm.  A hanging T-bar is at the centre along with a short piece of chain (22mm in length) enabling another item, e.g. a fob, to be attached.  This chain is previously owned and has a gross weight of 39.9g.