Unknown Pin hole

I have a 1959 MF TO35. New to me noticed a leak black oil from underneath the tractor, specifically, underneath the area above shifter there is a perfect small pin hole that looks like it belongs there. Is this part of the design? Am I missing a plug?
 
I suspect it's missing a cotter pin. That pin rotates and keeps the hole clear to allow any seal oil leakage to drip out that hole.
 

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