According to the seller, the NSFK engraving on the horn is the acronym for the Nationalsozialistische Fliegerkorps. This was a paramilitary flying corp that Germany created, since the Treaty of Versailles prevented them from having a true air force.
If you want to change how many album pictures per page, use CTRL+ and CTRL- (Command + and Command - if you have a Mac). 80% looks great on my 4K monitor.