The zodiac emblem is....

I am sure the Zodiac Killer  emblem ( circle with a plus throught it ) is a gun site and not really tied to the Zodiac Sea Wolf watch .
It was from the gun site on a gattling gun back in Vietnam on a cayuse  hughes 500  rear door gun
I saw and had an image off the net  of one that looked exactly like it . I am having trouble finding it again now ,think I saved it on my last computer but it blue screened one day The longer length cross and verticle line marks giving a more usefull indication of where to shoot  when doing 15-40 mph in the close combat situations they worked . yes I have reason to know this but do not want to give that info yet to the public..
Also the zodiac hood was from Nam used to sheild the door gunner from flying hot brasses off the gun and to hide his ID from VC or anyone making him unknown to them and less of a target

It also was used by the Minutemen before Zodiac used it so there is another interesting option to consider.

bump

^ Well that is something I haven't seen before!