830 is real silver, your item is probably danish or from Finland but its a lower grade of silver as in uk its 925
L stamped inside a ring
Palladium. It is a metal in the same family as Platinum, and it looks a lot like Platinum, but it is a less expensive metal. If it was Platinum, it would be marked "Plat" or "PT."
When UTC 925 is stamped on jewelry it means that the metal is 925 hundredths of the metal. The UTC means that due to the purity of the metal it should not be worn during ultrasounds, in extreme or sudden changing temperatures, or when it could come into contact with chemicals such as hairspray, perfumes or cleaners.
Stamped steel.
Self Addressed Stamped Envelope
As the Common Metal Marks Stamped Inside Rings, TI=Titanium
Transmission pans can be cast metal, stamped metal, or plastic.
830
50% of 830= 50% * 830= 0.50 * 830= 415
42% of 830= 42% * 830= 0.42 * 830= 348.6
830
30% of 830= 30% * 830= 0.3 * 830= 249