Model VIII, I think. Nice gun. I'd expect a German double to be choket tighter than tight. However, the only way to say how a gun will pattern is to pattern it. You may want to consider spreaders; these Germans often pattern so beautifully - if tight - with smallish shot, that one simply can't bear to mess with them
Edit: on the other hand, German guns do have smaller bores for gauge than the world's average. That, as 2-piper noted, will mean that a modified for a larger bore diameter would be IC for smaller. And, why would anyone stamp choke markings - in English, and looks like in different front from the rest of the marks - if they were standard? So, patterning seems to be inavoidable.
