www.925-1000.com

Is it possible to determine the age of the item by these signs

Hi,
The Repunzierung (restrike) mark 12D was introduced in 1806 for taxation and duties on gold and silver (Austrian Empire).
The letter looks like D (Lemberg assay office). Lemberg is Lviv,now in Ukraine.
That said, engraved 1790 makes sense.
12 Loth is 750 fineness.
Regards

Now I think I saw the signatures on the inside

The Austrian Empire for Repunzierung also see:
http://www.silvercollection.it/austrian ... marks.html

Peter.