The Harley Topper Horn number is: 69005-59
The center Horn adjusting screw plug is: 69039-59
Hella is the name on the center Horn adjusting screw plastic plug.
Hella made in Germany has been making ball horns,candles and kerosene lamps since 1899.
The Hella horn was also used on the following
A bracket was used to mount the horn to the motorcycle.
1960 - 1966 Harley-Davidson Super 10, Pacer, Scat, Bobcat
Horn Rubber Gasket no. 69053-59
Topper Horn Terminal Screw no. 69030-59
Back side of Hella Horn