Most tower issues are fairly common, particularly the later ones. All issues are hammered, with the later ones often being poorly struck on flans of irregular size so perhaps not all of the legend will be clear.
Collectors should try to obtain an example with a clear king on horseback, a clear mintmark, and as much of the legend as possible. Many of these issues have been found in large hoards, often buried during the English Civil War.
They are usually available in VG to VF condition and, although EF examples exist, coins often left the mint in only VF condition. Moreover, many are found clipped, some coins are found with what looks like deliberate nasty scratches and while the reason for this remains open to speculation, it could well have been the work of a contemporary ardent anti-royalist.
This is an outstanding example so much of the fine details show and are clear that owning it will be a real treat!