To the above: ^^^^^ (which includes a quote of mine that was edited to have it not mean what I wrote)
I look for unmarked examples "Partially" but not exclusively. I will, however, pass on things that are marked in such a way as to be essentially vandalism (see any Tokarev marked by Century as an example) and will rather pick a sample for my collection that was *tastefully* marked if an unmarked example is not available.
Importers really ought to be a bit sensitive to what they are doing when the mark these. They definately reduce the value and desirability if they are not respectful when they add markings.