panther chin armor if off 50 is to thin and if it says perks should be lower
http://www.lonesentry.com/manuals/90-mm-ammunition/index.html
the is a us manual on data from a 90mm gun verse panther
it states the panthers lower nose plate is 55 degrees and is 2.4 inches think
2.4 inches is is 60.96mm cough cough... 61mm

and we only have 50mm of armor.
shananagans!
Problem with wikipedia is anyone can be a "historian" and upload without even checking the source for verification - - You have to gather sources and make sure they are corrected, for example here are my sources:
Osprey New Vanguard 067 - Panther Medium Tank 1942-45
cites the Panzer G's Chin Armor as 50mm on 55degree angle, they lowered the armor from 60mm to save weight since they did not want to surpass the Panther A's 44.8 tons.
However - Schiffer Germany's Panther Tank The Quest for Combat Supremacy
Gives the Front Lower Hull at 50mm 55' degree angle (also sourcing the same reason to save weight).
Your information could be linked to the Panzer A and D Models which both had 60mm at 55 degrees (Front Lower Hull Nose)