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The bottom line is:Your going to have peening marks on the pin,no matter how polished the hammer or anvil is.

A small anvil type device is pretty much mandatory for pinning work,and useful for many things.
You can make one for a couple bucks. I used a body work Dolly (kragens, 3 bux) some minor...

The anvils as used above perhaps wgt about 8 oz,max

I just take off any heavy grind marks with emory,Since I polish the pins by hand after peening any minor transfer marks from the hammer surface are of no concern to me.