Still looking for any info about this one, my first mando, 40 bucks from a friend: Stamped 'Wilelm Krüse Markneukirchen', reportedly about 70 years old. It's a flatback, A-style, offset kidney-shaped sound hole, pickguard looks like cowhorn, but can't be 'cos it's too big and in one piece, position markers look like aluminium! Really beat up, but bags of volume, and good to learn on.