Here is a link I found to an early model rifle for sale in .375 N.E.
https://heldef.ch/manufrance-simplex-a2418/Here is an early model in 28 Ga. Plain grade but nice.
https://historical.ha.com/itm/long-...mplex-single-shot-shotgun/a/6140-40434.sI also found an early 12 gague that sold on GI which had a rifled 12 gauge barrel but no sights. I suspect it was one of the few spreader barrel attempts sold over the years.
Looks like this entire model line had a lot of diverse variations over a lot of years. I would think this would be an interesting collecting niche for someone in Europe.