This one is Alexander's latest model, reminiscent of a horn they made in the 1970's and nick-named the "Heldenhorn".
It's a Knopf/Geyer-type design, but with significant differences from the well-known Alexander 1103. This special model 1106 is a yellow brass horn, with hand-hammered bell spout and detachable bell flare.
This horn shows typical Alexander superb workmanship and construction.