Δ  The first specimen, is possible the only known, outside of any museum.

The coin, auctioned July 10th, 2010, through e-Bay of San Jose, California, U.S.A., was listed by seller B.C.Pickins as Rare 5 superb condition, ironically he bought it from someone selling a collection on e-Bay around 2005, unfortunately there was no provenance or documentation with the coin.

The reverse of this particular coin was struck with medal die alignment [upright die axis] ↑↑ or die rotated 180º. Encapsulated by the company NGC, but erroneously certified as business strike Mint State 63. Now resides in a bank vault on private hands.

Δ  Museum of London, whose present structure opened doors to the public in 1847, carefully guarded within the collection of the Department of Coins and Medals, perhaps the only know specimens in public hands as follows:

1 — Images of specimen II. © The Trustees of The British Museum. LINK

2 — Images of specimen III. © The Trustees of The British Museum. LINK

Both specimens which certainly are in excellent state of preservation, if not the finest known, were struck with the regular coin die alignment ↑↓. [2]

According to the Curator of modern coins of the Department of Coins and Medals at the museum, they arrived at the institution in the year 2006 as part of the Foreign Office collection. The original wrapper in which they were stored, maybe for over 145 years, has written "two impressions".

We agree that it probably refers to the fact that these were presentation samples sent to the Colonial Office, and not to these being the only two struck. Perhaps the recipient of them at the time was the Secretary of State for the Colonies, Henry Pelham-Clinton [1859-1864]. It is just a hypothesis, since there is no paperwork with the coins to confirm any more details.

It is thought that all coins were struck as specimens of the last year of the denomination.