Drilling Combo gun liberated off some Germans after WWII by my Grandfather, while the rest of the officers were snatching up Lugers. 16 gauge double barrel shotgun up top, 9.3x74r (I believe) underneath.
From the research I've done so far, it appears to be the same make as the JP Sauer Luft Waffe M30 survival drilling, which go for quite a bit of money in good shape. The only difference is that it doesn't bear any of the nazi stamps (swastikas and eagles) on the barrel or stock, which leads me to believe that it may be a pre-war civilian model.
If anyone could help shed some light on this interesting and beautiful gun, I'd really appreciate it.