(Embossed on top) TYPE B / (arc) S&H / VOLTS 100 / AMPS 25 / PAT JULY 23 12 / JUNE 29-15 / OTHERS PEND. / CHICAGO (Embossing on "stick") PAT.APL. / FOR. This came out of a Chicago Substation 10 years ago. It has a wood cap with a clip on it that pops off when the fuse blows and explosive gases are created. There is a wire that holds the fuse stick in place. $95 postpaid.