[OM] rear coating

[Matt BenDaniel]

I received a Zuiko 50/3.5 with a permanent fingerprint on the rear element.  
The fingerprint does not come off with standard lens cleaner.  It's easily 
noticeable but not heavy.  Would such a defect have more effect on contrast at 
close focus or at far focus?

I have asked John Hermanson about repair, and I think the total rear element 
replacement cost would be over $100.  The rest of the lens is near-mint.

Any advice?

Matt BenDaniel