I was recently listing a 1699 British George I Halfpenny on ebay (https://www.ebay.com/itm/254132090583) and examining the pictures as I was posting, I noticed it is a 1700/1699 overdate, which are the only 2 years of mintage. Also, the IA of BRITTANIA look clearly recut or doubled.
Realizing the picture doesn't do it justice, closer examination in hand looks like it is more of a 1699 over 1700, with traces of the 7 extending past the top of the 6 and through the right side of the 6's loop and both zeros looking as if they had the tails of the 9's added.
I realize overdates are common in older coinage, but is this a particularly well-known type?
I don't think you would convince me of an overdate on that picture! :-) The 6 over 7 is just about possible, but not at all clear. The 9s are as they always appear for this period - they look like 0s with a tail added, but they always do, so I don't think you sell those as an overstrike. Coins of England do not list such an overdate - although it may appear in other references that I do not have.
I am unaware of a 1700/699 halfpenny. The Nicholson collection featured many 1700 types/errors, and he did not note any overdate like that either. Looking at the full image, I don't see any overdate.
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