Of > By
Mulciber > (A surname of Vulcan, god of fire; see PL 1.740 ff.)
5 Some others were new driven, and distent
driven > beaten out distent > extended
6 Into great ingots, and to wedges square;
to > into wedges > ingots
7 Some in round plates without monument;
monument > mark, inscription
8 But most were stamped, and in their metal bare
bare > bore (vb.); or: bare (the vb. "were" being understood)
9 The antique shapes of kings and kaisers strange and rare.