Three classic old Selmer brochures from the 1960s, featuring some of their early amplifiers, organs, tape echoes, etc.,, Swisstone tape echoes, Meazzi Factotum, etc etc. 
In very good condition for their age - see the photos.  One's back is a bit messy, with a music shop stamp from Woods of Whitstable, and some other marks - possibly a botched attempt at the stamp.