Vintage pocket score, early 20th century.  Donajowski's Miniature Score.  7.25" x 5.25".   Undated, but looks early 20th century. 

Condition

Vintage score, over a century old, and in good condition for its age.  Pages are clean and tidy, with a couple of pencilled annotations, and some age-related spotting, mainly on the first few and last few pages.  Minor damage at the top and bottom of the spine.  The paper covers are in fairly good condition.  Previous owner's initials on the front.