I've got an early Hohner - 1954 - it doesn't have the ring bumpers on the key guards, just the surrounding guard, which is one piece around B & Bb not 2 separate guards. The B & Bb areconnected straight across the key cups from the center, not diagonally as this horn is. The low C cup shares the rod with B & Bb as well. Early Hohners seem to all have an extra D trill key which resembles a high F# key, which this horn doesn't have. The chromatic F# is also different from a Hohner.
But it does have the bell key mechanism mounted on the bell, like a Hohner.
Does it have a double socket neck receiver?