First pic is (obviously) pre-98 PMC, which was loaded to M193-specs (nice and hot, just like current XM193). It was mainly known for the huge flash signature, just like XM193. If it was stored well, it is excellent ammo.
Second pic is older IMI, back before IMI had direct importers. They made ammo for Hansen under contract, much like they are making M193 for Winchester now under the Q3131A name. Again, if it was stored well, it's great ammo.
Third pic is Chinese Norinco ammo. This stuff is a little under M193 specs, and while the primer isn't corrosive, the powder seems to be a little corrosive, and so you need to clean your gun well after firing this stuff (anywhere the gas goes needs to be cleaned with warm water, then as normally). Since this ammo isn't available anymore, I can't make any ballistic judgements about bullet fragmentation or anything. If you were looking for ammo to save vs ammo to shoot up, I'd put this in the "shoot it up" category.
-Troy