Ithaca33:
The mention of "Simpson's" LTD. by a helpful poster above, is a name of a Gun retailer/Importer
The German maker you wish to search for is Simson (without a "p" in the spelling. Very Nice quality in all grades, and yes, up there with Sauer and the more common Merkel.

I have a nice 20 bore Model 74E with 28" bores, side clips ,third fastener, cocking indicators and intercepting sears that sees very regular work here at the ranch.
Good luck in your search.