The original Altettes date back to 1930. As the standard Lucas horn, they probably appeared quite early on MVs. They were certainly in use by the mid-1930s.
There were various small changes over the years, particularly to the body. They seem to have changed for the final time during the early 1950s when they gained a 'corrugated' tone disc. As far as I'm aware, the motor industry replaced them with something cheaper to make during the mid-1950s.
They're certainly heavy enough to give the mounting brackets a hard time. I can imagine why this one's been welded on.
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