Has anyone heard of Leopold Bieder or Leopold Bieder Wien of Vienna?

I just bought a double by this maker from the latest Poulin auction:
https://www.invaluable.com/auction-...mpaign=lotwonlive&utm_content=178321

Looks good and I've always been happy with Poulin's descriptions, I'm just curious to learn more about the gun. A lot of the doubles in the Saturday auction came in below the listed minimum estimate.

If anyone else followed Saturdays's auction I'm curious if you think the bid prices were low or if possibly Poulin was optimistic about their estimates.

I have become addicted to English hammered shotguns to the detriment of my wallet.