irishpapermoney.com

Comments on the Ploughman Valuations section are welcome here..

The valuations provided for the Ploughman notes seem reasonable to me. Valuations for some of the rare types such as the Northern Knox £1 and Provincial Kennedy £10 might even be conservative.

A significant number of the more common Ploughman notes have appeared at auction over past 5 years and this has tended to depress prices. However, there is good value to be had now so it may be time to take advantage of the current prices

The Bank of Ireland £10 Ploughman, being the rarest after the Northern Bank, seems to be undervalued

The Bank of Ireland £10 Ploughman is currently about as rare as the Ulster and Royal Bank £10 notes.

It is indeed undervalued imho.
However, because Bank of ireland is the most common bank by far, I think people have always assumed that its notes are alll relatively common.
A Royal or Ulster tenner will generally sell for a higher price than one from Bank of Ireland.