This was not such a box, but an old Swedish Bee Hive called Trågkupa and it is a Horisontal hive (as the African Top Bar Hive).
There are 4 entrances to choose from. There is space to keep up to 4 nucleus colonies in it and even to overwinter them in this hive
Low-normal frames. I would replace those with Top Bars big time
a follower board
Trågkupa Hive is huge :) or maybe it is Rolf which is small ;)
In the last photo one can clearly see the space from both sides of the inner hive box. Its like a hive inside a hive :) The space is used to place insolation like hay, wood shaweings, Old duvet covers, raw wool, ...
It is possible to staple 2 new boxes on top of this one but it becoms very difficult to manage/harvest, sais Rolf. He adds to it "this is the best hive to overwinter the bees in". He keeps no bees in this Trågkupa, rather his choice is Half Langstrot frames in vertical boxes. He is treating his hives with Oxalic Acid ... I think in Autumn once a year.