Another delayed reaction, but ...
I happened to come across something called the "Dark Shadows FAQ." I'm not sure where it is or how I found it -- I think it used to be linked on Mr. Juggins' webpage ... I know I saved it on disks a few years back. This is an excellent compendium of knowledge, with some of the best material on DS I've read.
Any way, according to the FAQ, the image on Gerard's watch fob stolen by Lazlo represents the Colussus of Rhodes -- one of the Seven Wonders of the (Ancient) World. I'm amazed that someone was able to identify this ... I know I looked at it but couldn't identify the image ... to me it looked like possibly a religious medallion.
At any rate, the FAQ author points out that the Colussus itself is a representation of Helios, the god of the sun (later Apollo). Somehow I find this very interesting ... maybe because Apollo, as the patron and inspirer of reason, order, and poetry (if I'm remembering my Greek mythology) has always been my favorite among the Greek pantheon. I seem to remember that he was often seen as the direct opposite of Dionysus -- god of unreason, licensiousness, etc.
Interesting if the icon of Apollo was carefully selected for Gerard. In some ways, it does fit him ... the original Gerard, that is. Despite his gun running, opportunism, and other exploits, Gerard also was a man of some culture and sophistication ... he plays the piano, for instance; and appears to fit in comfortably with the aristocratic Collins family.
Yet the danger Gerard represented, which has magnified a thousandfold with his possession by Judah Zachary, makes the iconic image of Apollo an ironic representation. Given the destruction with which Gerard is now associated, perhaps the proper symbol for Gerard/Judah would be the opposing force of Dionysis, destructive and seductive ...