I believe Barella was a high end Berlin gunshop that did not survive the war. I believe they had guns made under their name in Suhl. Usually very good quality.
Barella is warmly remembered in the 'Net especially for their highest-quality "best guns" for nobility, royalty, capitalists and the like. They certainly belonged to the most reputed gunshops and purveyors, first in Magdeburg, then for many decades in Berlin. Their remembrance is a bit slanted by the richly adorned and superbly engraved guns, which of course are preferably pictured and lavishly described on auction sites and web pages (e.g. on Germanhuntingguns.com). They were dealers in the upper echelon (like Bock, Schiwy, Foerster, or Eblen in Stuttgart). Igor Karklinsh wrote an article on him, his "shotguncollector" website, but access is reserved to registered users.
Yet, while Barella also used the moniker "Gewehrfabrik", and while they certainly had a good workshop at their disposition, we know that "Gewehrfabrik" otherwise more often than not was a prestigious name for somebody who had other craftsmen assemble guns to their specifications.
If you peruse the 1928 Barella catalogue (online available as digitalized file, via the Georgia National Library) however, you will see that they also offered and sold many plainer and less expensive guns.
Regards,
Carcano
