[mrmatt]

I have a gold navy bar that has 1\2010kgf on it what does it stand for?

[astraljag]

It means less than ten carats gold filled. Gold filled means a layer of gold at least one twentieth of the weight of the piece is applied on top of either sterling silver or jeweler's brass. Gold filled is superior to gold plated in that it does not tarnish nor wear off, and for all intents and purposes looks like gold