on 03-05-2013 11:47 AM
If it's not stamped as such I don't know how to tell from a picture.
You can check this:
on 03-05-2013 11:49 AM
A dish is unlikely to be 99.99% silver.
It could be Sterling silver, which is 92.5% real silver.
Sterling silver is always marked. Various marks are used including 925.
You can google these marks.
Silverplate is sometimes marked- again with various marks, or it can be unmarked.