I recall both auto 5 and superpower two barrel case but not a three at least in the Hartman line
The one I found is a newer Browning case, not a Hartman, but I got it about 10 years ago. May have already been discontinued when I found it, new with tags. Outside is smooth leather, a bit darker than a Parker Repro case. Takes 30" barrels (at least). I bought it for my BSS Sporter 12 that will become a three barrel set once I find some 26" barrels for it.
FYI, I think there was a three barrel Hartman on Gunbroker last week.
