I know the Type 59 has terrible spotting but I literally rammed an invisible Wespe, I mean, I rammed something, 3 seconds later aftr the Wespe rotated I spotted it. With a 100% crew you'd think i'd spot a tank right in front of me lol.
I heard that the Jagdpanzer 1 was the best at camo, TD, tier 2, small and with 100% camo and camo nets. I'm sure you'd need to be like 1m away from it to see it. Its a ninja tank.