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Allocated storage refers to storage of client precious metal on a segmented (segregated) basis.  The precious metals stored at the Perth Mintⁱ are recorded on the Perth Mint Certificate.  In this type of storage, the client's precious metal products are stored separately in a sealed, safe deposit box that is specifically assigned to the client via the Perth Mint Certificate.  There are annual storage fees charged for allocated storage as well as fabrication fees.

Unallocated storage refers to a specific quantity of precious metals on an unsegmented (unsegregated) basis, which are owned by the client, but is part of a larger pool of precious metals stored at the Perth Mint.  This quantity of precious metals is recorded on the Perth Mint Certificate.  Perth Mint has an obligation to deliver the recorded amount of precious metal upon request of the client with two weeks prior notice.  A fabrication fee is applicable at the time of deliveryⁱ.

You cannot determine the authenticity of a goldⁱ barⁱ by visual examination.  The bars will typically reference a weight and that can be determined by putting it on a scale.  The smaller sizes, 1 oz., 5 oz., 10 oz., are usually minted bars and are difficult to tamper with.  But, kilos, 100 oz. & 400 oz. bars would need to be melted down to determine the accuracy and weight and finenessⁱ. 

A hallmarkⁱ is the name of the refinery on the bar.  There are a number of recognized hallmarks, such as Credit Suisse, Pamp, Johnson Matthey, Engelhard, etc.

The accepted purity of goldⁱ bullionⁱ has changed over the years from .99 to .999 to .9999.  The accepted standard today is .9999 fine, or 24 karatⁱ.