I believe MauriceRoss has solved this. Here is a scan of one of the Romic books, with serial numbers starting at 13,003 on 8/11/80.
My number is 1209272880 meaning 12,092nd frame from 7/28/80. My frame would be a page or two back. I think the chances of this working out so nicely would be slim unless this is actually true. I'll have to do some digging and try to find those pages.

Now to find some decals!