LOL - Its been a long day and I could not think of another way to word it.
Well I was hoping to narrow it down to month, week, etc. based on the mobo serial. For example I have an original 128k mobo and the later 512k version. The 68000 on the 512 is an earlier produced processor. While I can average the dates, I suppose, its still not perfect. And I really don't know how many companies follow standard date coding. It seems like some don't. But I will have to look into it more.