Spink’s March 7 sale of the Arthur Gray collection of Australian pre-decimal stamp booklets will include a one of a kind 1904 £1 black on red.

This booklet is the only known example of its kind 

The piece is inscribed at the top “P.O. 03/3505 Specimen booklet from Secy. P.M.G. Melbourne".

There are no stamps inside this booklet.

Instead, buyers are paying for the booklet itself. This is among the most coveted in the hobby, with no other specimen known.

It’s estimated at a phenomenal £10,000-12,000 ($13,850-16,620).

Click here to take a look at our fascinating range of rare stamps.

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