It's really too bad that these photos aren't bigger. Not only does this horn have an altissimo F#, it looks like it has an altissimo D# trill and a fork Eb mechanism. I doubt Selmer made more than a few of these.
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.