DG-400: alto model
DG-500: tenor model
DG-600: Baritone model
GL: gold lacquer
BN: black nickel plate with silver plated keywork
SP: Silver plate
Rare examples in rose gold
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.