Is this 58T Musial Trimmed?

[Eric72]

Originally Posted by Gorditadogg

...The card measures just under 88 MM top to bottom, my other 58Ts are 88.5...

Topps cards from the 50s will vary slightly in size from time to time. The equipment used to produce these cards were not hyper-accurate. Additionally, Topps quality control was not concerned about a card being one millimeter short in 1958. Even 20 years later, they wouldn't have been concerned with a variance that small.

Long story short (no pun intended) - you can't detect trimming on '58 Topps with a ruler alone.