Bosch Horn Help - Revisited

Wow.   DeJa Vú all over again from 2010:

https://www.speedsterowners.com/topic/bosch-horn-help

I got Hellas from Sierra Madre Collection many years ago; advertised as replacements for later 12 V 356s and 912s. The frequencies are 310 Hz (low tone) and 380 Hz (high tone). I believe they still offer them.

I've also seen numbers of 290 Hz (low tone) and 345 Hz (high tone).

The Bosch 12/27 wasn't part of a pair that I am aware of, certainly not for the Volvo 1800.  It's possible that it was a stock horn re-designated as 27(Volvo) so it may very well have a mate as many horns do under a different number.  I'd love to find the list of all Bosch horn designations, other then the MB, Volkwagen, Porsche, 25/9-Lancia and 27/12, 12/17-18 Volvo I've found very little information.

Sadly when I respond to older messages on various forums its not the thread that is the only thing dead!

I just bought the Wolos. Same form factor, right down to the ID plate.

Do they happen to say where they come from?  I bought a NOS Bosch set from a company in Tbilisi last month.  This company is producing repros in a variety of colours and metallic platings. In fact the Caucuses are a hotbed of horn production.

I'd be shocked if the Wolos weren't China or Taiwan. But it's been three years so the boxes and stuff are gone.