I have bought from both the son (Blackburn) and the father (Kebco.) The guns are as they state. Some of them are GDR guns built in the Ernst Thaelman Werke and others are older pre war guns built by Merkel, Sauer, Simson, and others. You can tell which are which and what is what by his descriptions and photos of the proof marks which he usually offers. The pre war guns are generally better made guns, but also generlly show more wear. The GDR guns can be good guns, depending. The prices are fair for what you get, and they are an honest importer bringing in many guns through their Swedish connection from all over Europe.
The first time I saw a four ring Krupp mark was on a set of these barrels, and our friend Geno explained that it was Russian steel used by Ernst Thaelman Werke for their barrels. I still have a couple of those guns, marked as Simsons, and have had good use from them.
