Thanks for the help - I have yet to purchase the gun largely due to my lack of knowledge of its value and, therefore, do not have any pictures. However, it may be possible for me to get them in a few days.

You're explanation for the markings I described is correct as far as I am concerned, and I had found Sporthaus address as indicated by Petrov.

I hope to get pics as I would love to ID the gun. Do you have any ideas as to the gunmakers that would have been supplied by this retailer that would fit the description?

Also, I failed to mention that the gun does have a Greener Crossbolt.