Hello I'm new to the group and I was hoping to get some information on my Zodiac. It was my grandfather's, I was told he bought it while he was in the military. I know that it has to be made after 1949 since it is a self winding. I have passed it down to my son since he wanted a watch to wear with his uniform. Any info would be great. It has 2 numbers on it 184890 and 73420

That first appears in the 1971 catalog but could be very late 60's. The catalog says it is a manual wind though.