David and Sarge -
Mine is a side-plated 16, arabesque engraving, str. grip,
DT (articulated); 1930's, looks more like a Merkel 50 or 247 than yours and reb87's.
But it does appear that all of us have the same ejector/ extractor conversion.
I've seen 3 others - post-war, and again different: An o/u here and in England; a 12 SxS in Florida.
I don't think any had the drop-ejector mechanism.
A collector pal says, -You know the Europeans with their gizmos..& you like the orphans -- when're you gettin' yer French gun ?-
Wish I had some info to share, as well as photos.
Sorry, no pics --lost my place this year .. keep forgetting to buy a digital camera.
T.