Bosch Horn identification

[Douglas711]

I have a Bosch Horn I think it might be for a Barndoor. When I searched the net I couldn't find and kind of identification website or anything with the same or similar numbers on it.

It looks like the numbers and letters are HO/FDF 6/4? It looks like the number after the 4 is a 7.

Any idea what the HO or FDF mean?

I did test it and the horn does work.

I am going to list it in the classifieds. This is not a for sale ad, I am asking for help identifying it.

[djfordmanjack]

HO means Horn.
I think that is a capital 'J' after the 4.
you should inspect the horn housing for a stamped 1 or 2 digits/1 letter code which will tell the year and month manufactured. fe 7L would be July 1955.
still could be the correct type of horn for a BD, but later production stamp would date it for Wolfsburg built post BD bus use.
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Hotrods, Fords, Veedubs and Triumph Twins !

52 Barndoor DLX Coachbuild project
55 Wolfsburg panel project, og paint Taubenblau L31
62 Dickholmer, custom color Seeblau L360
63 1500 Notch, og paint Rubin Rot L456
67 1500 Käfer, og paint Lotus weiß L282 w/red interior

[janerick3]

The date code is burned in on the connector block.

The 6/4 indicates a 6 volt, high tone horn; 6/3 is low tone.
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Thanks,
Jan K.