Hi Corrado
That second piece is a very nice trombone military example, and appears in great condition. I believe the barrels are sometimes referred to as elliptical.
You seldom see these barrels today. My guess is there was no real ballistic advantage of the oval versus the round bell muzzle (?) This one is probably the best specimen I've seen.
Another interesting side note is the dog-style, external safety. The Austrians - and especially Dutch - military continued this safety feature long after the rest of Europe discontinued it's use. So it's not surprising to see it on this gun.
Again, great piece.
Rick
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