Are These german marks?

[cww1960]

I have this cup with a mark I can't find in any of my books, the closest seems to be German, can any let me know if this is correct?

Thanks

[Aguest]

The diamond cartouche with “A 900” points us towards Belgium, there were many variations of this hallmark because Belgium did not have a compulsory system of standard marks for many years of the late 19th and early 20th century :::::

I get a Belgium feeling here ::

[amena]

This mark has already been discussed before in 925-1000
viewtopic.php?f=24&t=45909&p=134764&hil ... NA#p134764
Someone attributes it to the city of Modena before 1860
https://hallmarkwiki.com/?ShowHallmark=15805
But it's not true. Modena has never had a similar mark.
It is probably an Italian fantasy mark struck on objects produced between 1870 and 1930.
Best
Amena