Handmade Hardcover Math Notebook blank unlined pages and graph paper

Handmade Hardcover Math Notebook / journal for the serious math student ;D tan cover with math, calculus, geometry equations back cover and binding is black blank unlined white paper pages interspersed with graph paper alternates about every 10 pages bought circa 2012, but never used some wear around the edges, and a dent in the back cover approximate dimensions: height 11.25" width 8.75" depth 0.75" (see pics) questions? please ask!