You might want to research antique copper charger plate". Think you will find more.
You can also try and use this English Armenian translator to try and translate the inscription. It contains lots of common words phrases as well. Just take a little time with it and you can find alot of information there.
http://www.lexicool.com/armenian-dictionary-translation.asphttp://en.glosbe.com/hy/en/Unless you know the origin/maker they sell anywhere from $19 (small sizes) to $130 for the larger ones. I have seen the 15" average for $39 to $49 and 19" $89.
Here is one similar to yours that someone is "stating" to be from the 17th Century for $65 or best offer on ebay
I would hope that if an item was truly that old that it was sold in some specialized market and going for a higher price. Where? I really don't know. Where I am there unfortunately isn't a large demand for these.