>>60924476
>Those are .999 Troy.
It seems you're new to this, so FYI...
"Proof" refers to the coin having a mirror-like surface across at least some portion of it. It's not a certification of content. "Reverse proof" means the background has a matte finish and the emblem or feature of interest is the shiny bit. "Uncirculated" (Bright, Almost or otherwise) can have shiny surfaces, but typically not mirror-like.
The ".999" is the guarantee of purity, with 1=absolutely, impossibly pure. The decimal point can be placed differently depending on the mint, but read it like a percent: .999 being 99.9% pure.
"Troy" refers to the scale units for mass/weight. One troy ounce ("ozt" or "toz") equals 31.1048 grams, and is the common unit to measure precious metals. The avoirdupois (avdp) ounce ("oz") equals 28.34952 grams. This ounce is used for almost all other objects: food, for instance. Because convention for PMs is to use troy ounces, coins, rounds, etc. are typically stamped simply "oz," leaving you to assume they mean troy.