R17c is a moderately scarce stamp (current catalog value $200), so not very much plating has been done.
I stumbled across the stamp below on a CDV. For one, the centering is VERY nice, but the second thing I noticed are what appear to be plate scratches across the top. However, without a confirming example, it could just be printing/inking anomalies.
So if anyone has seen an example of R17c exhibiting the same scratches, please contact me.