Title. There are lots of miniatures which are undoubtedly oldhammer. But how do we count those released during 3rd/4th editions? Things like metal Inquisitorial retinues, Armageddon Steel Legion, some space marine kits like Land Speeder (which is still alive and kicking on the GW website).
Well. I’m young, I don’t remember the earliest Warhammer. I got my first minis sometime close to the end of 3rd and certainly had 4th edition rulebook. In my personal perception 3rd is old, 4th onwards is blurry, 5th is new. Black Reach is certainly not Oldhammer.