These appear to be stencils of the B&S Series 1000 intermediate horns.
Eb Alto 0043XX
Säit erstallt an 0.071 s (22 SQL-Ufroen an 0.056 s) -
Ennerstetzt vun Piwigo
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.