Have not forgotten your inquiry Raimey. The trick is to find out the correct model number. As I learned, the Latin and the Arab numerals are not sequential, and a Model XXX is a totally different gun from a Model 30.
Anyhow, my Drilling is either a Model 30 or 32. It does not have the usual left side safety, like most, but instead the external swinging safety lever which blocks the cocking pieces. Called "Schlagstücksicherung", which probably was a special order upgrade.

The quality is very high; engraving is "feine Englische Arabesken", with the accentuation on "fine", and its execution is better than of the most Sauer game scenes. Overall, if compared to the well-known and highly esteemed ($$$$) normal Mod 30 Luftwaffendrilling, mine is by far the better gun.
I do not own Jim Cate's book (which is quite expensive - when you find it -; it costs more than *I* paid for this Drilling), and the former Swedish Sauer collectors' website of P.O. Haggards seems sadly defunct. Would anybody have access to the reprinted 1938 Sauer catalog?

Regards,
Carcano