Any way to date these silver rings ?

[Gregg3131]

I don’t usually dig a lot of jewelry but dug these two next to each other. Looks it says 825. Also looks like a makers mark? Any idea how old these are and info based on makers mark. Thanks

 

[ripvanb]

I think the “THA” stands for Thailand. The 825 may mean it’s gold and comes out to around 19karats. Or if its silver 82.5% silver.

 

[Indian Steve]

I think your 825 is just a badly stamped 925