The horn tags from authenticclassics appear to be for the European models. I don't see tags with 290 and 345HZ. I would like these if anyone knows a source.
Will
Will, the 12/10 designation is 345Hz, and the 12/9 is 290Hz; see the original page from the Bosch horn catalog. Can't tell you whether every horn on every USA model were those specific frequencies, or whether the horn tags were the same. I do know that of several sets of "original" Bosch horns I've found on various years of our cars, the tags differed slightly. One original horn tag on one original horn I had was pretty simple; see photo. On another horn that Peter Lesler has, the tag contained a bit more information, like the ones from Authentic Classics. The USA horns should probably read 12/3 and 12/4…which are the same 290/345 frequencies, but make different designations. The 12/9 and 12/10 indicate "France" but I think Alfred translated this once before and it has more than that in meaning...
The Stoddard ones are all wrong, being for a 6V horn...