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If you check my ebay listings, I have an F-275 Last 1 over 1 listed. I also have an F-275 HIGHER F OVER F in F:D: listed.  I have never seen another  and had questioned Iain Dracott about it, but as he had not seen the purported F/P, he could not be sure whether my coin was actually what was identified as the F/P. See attached image  

Interesting page on Heritage Auctions UK comparing NGC grading to PCGS. This has been up for several months at least, it's dated 2015, and the unsigned writer clearly states his views. The link (heritageauctions.co.uk) doesn't seem to post so I've c&p'ed and compressed the paragraph spacing:   HERITAGE AUCTIONS The grading of quality and rare coins is a highly specialised skill which can impact tremendously on coin values.signed  There are 2 main international grading companies - NGC and PCGS both primarily based in the USA. As they both claim to work according to the Sheldon Scale of grading , one imagines that there should be a high degree of uniformity and consistency in the grading of coins, notwithstanding that sometimes human objectivity may sometimes be compromised if a grader is having an " off " day, for instance. However, levels of consistency can be compared when coins are submitted for " cross-over " grading which is where one of the 2 main companies undertakes to grade the coins at the same existing or other specified grade and will only encapsulate that coin in it's own plastic slab if the coin meets the minimum grade specified by the person submitting the coin. Otherwise the coin is returned intact in the original plastic slab and the submitter is told that the coin did not " grade ". My own experience of crossover is one where the great majority of my PCGS graded coins have failed to cross-over into a NGC slab at the same or a higher grade. I will be providing statistics as time permits. This surely is disturbing? This is why I buy as many NGC graded coins as possible from Heritage Auctions in Dallas, USA. It will be seen by looking at any of their coin auctions that a large proportion of the slabbed coins that they sell are in NGC holders, and given that they are the largest Auction house in the world that must surely say something!   OldCopper now: So for older slabs at least, an interesting take. Perhaps things may have changed since.

Given the scarcity of it, I would think a few dies are involved. Most of the metal composition/flan preparation/striking force issues were solved in the multitude of patterns struck in the previous few years, with some types only known with laminating flans for example. Never underestimate the Mint's ability to produce a number of rogue batches from time to time. In the mid-1840s, they were only getting a couple thousand from a die pair. A quick perusal of Linton's article in the BNJ regarding the 1848 halfcrowns is quite enlightening regarding flan quality for much of the decade. ‘The half-crowns of 1848’, 29 (1958-59), p.191-93. According to records, 91872 halfcrowns were struck in 1848. The mint had 13 obverse dies available at the end of 1847, all dated 1846. A further 16 (presumably unfinished) 184(-) were made in 1847, but not required, leaving them available for use in 1848. A potential 29 dies for the 91K struck, but only a handful of the unfinished dies (2 or 3) were completed and dated 1848, most being 1848/6. (One can assumed to be dated 1847, just to test the die batch). The previous year, a total of 22 obv. dies were used to destruction for an output of 367,488 coins. Hardly a long life by normal expectations. Again, there was an 1848/7 in the Adams collection which was possibly 8/7/6, but not conclusively so in hand. Similarly for the 1849/7/(6?). All very interesting, but requiring much speculation until clearer examples come to light.   The 1849 in particular, was a real dog of a coin, but even so, unambiguous for the 9/7.   Just because it has been given R16, it is only a reflection of the percentage of coins examined during research relative to other 1861s. What if a ton or two of output was lost at sea following despatch? We don't know. 

Dracott lists as 1 known. I know of no images If you're going down the Halfpenny Road, have a read of the halfpenny ID thread. You'll learn plenty.

Thanks for this info. Is there images online of the F over P in F.D do you know? The F over P in HALF looks like a die flaw to me just a blob/apostrophe of metal making the F look like a P. I was wondering if 1861 5+G F2755+G F over P in F:D: ?R20 Is a clearly defined P? Thanks