Silver plaque

[GeorgeG]

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

[AG2012]

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

[GeorgeG]

Now I think I saw the signatures on the inside

[oel]

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

Peter.