Yeah rustjunkie it's a AMP Research bike. They were made (badged or tanked in this case) for Mercedes Benz. Cool fork. They had a motocross version with 11" of travel but only produced several prototypes. Horst son told me it was to expensive to produce.
crude welding , seems to be a cool bike , there are structual areas that look like it was built , monday morning , or friday afternoon , at the factory
flying the Mercedez logo , i would think it was built like a German exotic piece of transportation