here was another Heinrich Barella sold by Bonhams once with Liege proof marks
http://www.bonhams.com/auctions/14917/lot/201/
A German 13-Bore Dreyse Patent D.B. Breech-Loading Needle-Fire Sporting Gun
By H. Barella, Königl: Hof-Büchsenm: Magdeburg U. Berlin, No. 1130, Circa 1880
With russet twist sighted barrels signed in full along the rib, serial numbered foliate scroll engraved action-chambers, the left one decorated with pheasants in a landscape, the right one with deer in a landscape, the barrels pivoting up for loading and the actions cocked by the foliate scroll engraved under-lever with spherical horn knob, figured butt and fore-end (cap missing), the former with cheekpiece, and dark horn butt-plate and trigger-guard, the latter with spur pierced with a scroll, Liège proof
75.3 cm. barrels

I would call it a transition model because its the middle between the older Berger gun and final Fürst Pless gun. in any case there is also another connection to Liege beside of the Victor Collette gun.