I just placed an order for six of these coaches. Being seven window coaches they do actually represent a prototype car on the Harz railway. Amazing how a new roof and underframe moulding transforms these exquisite little beauties into another railroad coach representation. I copied and expanded the stock photograph on the seller's site and it actually appears to have 'HSB' on the car side along with numerous car road markings. I am eagerly awaiting their arrival. I may need to consider a few six window cars from that other manufacturer, but then just one of their cars equates to around five of the other cars purchased.