Is my crank pulley OK?

[Greg Ames <greg.ames.90@alum.dartmouth.org>]

Oh wise list,

I'm changing the front oil seal on my 74 MkIV.  There is a small grove
around the crank pulley in the middle of the sealing surface.  Is this
normal, or is it a sign of excessive wear?  At $90, I'd prefer not to buy
another.  I have a spare 1500 engine; I haven't looked at that condition of
that one.

Thanks,
Greg