Having now looked at the two 260 H coins on the Tonegawa website I am now even more confused: they bear little resemblance to laniecrist's coin, whilst the 207 H I suggested looks very similar.
laniecrist's coin has a single dotted
border round the inscriptions and five large annulets with pellets within round this
The Tonegawa 207 coin has a double dotted
border and five large annulets round them (first image below)
The two Tonegawa 260s have three dotted borders round the inscriptions and no annulets, with a final thick line
border outside all. (second and third images below)
laniecrist's and the 207 seem relatively thick and have higher relief whilst the two 260s seem thinner and broader with thinner and lower relief inscriptions.
The
style of lainecrist's coin and the 207 are similar, whilst the
style of the 260s is very different (as one might expect from coins produced over 50 years later).
I think I am going to have to retract my previous post and suggest that lainecrist's coin *is* a coin of 207 H, but with the tail on the 'seven' misengraved with the final tail to the left instead of the right as it should have been. Perhaps the little rightward 'flick' on the end of the final letter is an attempt on the
part of the die engraver to correct this error?
Best wishes
Alan