Sentence:  "Mr B., heraldic <WSD>chaser</WSD>, says there are several processes in making heraldy plates, sketching, engraving, embossing, chasing and burnishing." / "H. & C., manufacturers of cloth and gilt buttons, say it requires some weeks to learn to chase the gilt buttons, which are done with small metal tools and a hammer. <WSD>Chasers</WSD> are paid by the peice, working ten hours a day, and some can earn $1 a day." 
Meaning of the word marked with <WSD> tags:  Someone who chases (decorates) metal; a person who decorates metal by engraving or embossing. (from 18th c.)