The photo shows 2 Northern Song Chong Ning Tong Bao 10 cash coins. The one on the left is Hartill 16.399, I am sure. The coin on the right is, I hope, Hartill 16.401 - large character variety.
The difference in character size is particularly noticeable in the Chong and Bao.
Left hand coin is 34.8mm, 12.4g. Right hand coin 34.7mm, 9.6g
What do you experts think?
They look more like H16.400 and 16.401 to me. Very nice.
I have another book that has 191 varieties of this coin, it is a nice cheap book available from xiangxiangkafeizha at ebay.
I'm not an expert but I'd have to go with 16.399 & 16.400, sorry. A 16.401 would be really nice (#3!) but is almost a mm smaller according to the rub. All character styles seem to match with 16.400 as well. Very nice examples!