Daryl
Usually, if it's described as having a refaced frizzen, someone has fitted a "sole". Most often this is done when the original face is so worn that there is insufficient material left to reshape the face correctly, and re case harden it. The sole is usually made from high carbon steel, shaped and fitted closely to the frizzen face. Then it is hardened and possibly drawn a little, then carefully sweated to the frizzen with soft solder, so as not to draw the temper above what's needed.