Here’s a thread referencing WMF catalogs and dating of marks:
https://www.925-1000.com/forum/viewtopi ... 00#p142290
The X-outs weren’t necessarily done in Germany or in the manufacturer’s sphere, so it would be hard to tell if this was done on their end for something like seconds or repossessed property to be disposed of. It could be by a dealer in secondary markets who provided used or re-sold wares. We have some posted samples of rub-outs or X-outs for user names, but I don’t know of any threads for manufacturers. Yet II have seen American examples of this happening when firms may have been acquired by a surviving entity. Most of that would have occurred long ago. (That, of course, would not be the case for WMF if this was their product.)