Centering

SOM

That nice looking Ken Houston card an OP picked up and presented to us got me wondering.
What is the toughest year and card design to determine 50-50 centering? I'll stick to baseball, as that's all I collect, and I'm also sticking to mainstream issues. But, anything goes.
I always find the borderless cards tough to gauge. So, I'll kick off the proceedings with my vote: 1975 Topps Baseball

CW

I would've put '75 Topps as fairly easy on the list. L/R is simple to judge, then just try to match up the bottom border with the L/R borders, provided they're 50/50.

judging the perfect bottom border on '72 Topps can be tricky depending if you use the bottom line in the nameplate or the line that surrounds the photo as the gauge of the bottom border.

'73 Topps can be tough, especially with Schmidt's RC (ie. tough to determine perfect T/B centering based on what you have to work with). '80 Topps can also be tough to judge overall 50/50.

maddux69

1980 Topps is a beast to determine 50/50 centering l to r. With the left banner coming out a little farther from the blue border than the right does, it really clouds your judgement.

1955 Bowman is another issue that gives me trouble determining proper centering. It is a good thing that the majority are off-centered!