These appear to be stencils of the B&S Series 1000 intermediate horns.
  • Bell Engraving Bell Engraving
  • In Case In Case
  • Serial No. 0043XX Serial No. 0043XX
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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.