Another somewhat enigmatic penny, is the Freeman 98, 1879 narrow date. Often crops up in grades up to and including VF, but only very rarely at EF and above. They do exist - getting one is a whole different ball game.
One UNC with good lustre (touted as possibly the best) went at the Workman sale in 2010 for £1500. Another went for £520 at the Laurie Bamford auction in 2006. There is also a very nice one pictured on Tony Clayton's website. At this moment in time, they're the only three I recall seeing in high grade. Although an EF speciment went at the Freeman auction in 1984, with a 94, 96 & 97, for £162.
Really not easy to get in top grade, as rarely offered.