These were, I think, one group in a series of Gibbons peg albums - Devon and Exeter are others. There were linen-hinged and standard pages. The Devon album was available until quite recently, but has, I think, now been discontinued. The Frank Godden peg albums were the same size.
Dauwalders had white quadrille leaves to fit these albums, although they aren't listed on the website - you could email them if interested. My memory is that they sold them as "Monarch".
https://www.dauwalders.co.uk/salisb...s-2134-c.aspDevon etc binders come up on
ebay uk - I must have sold fifteen or so myself.