As we've mentioned many times here, relying on posts that you dig up on the internet is a good way to get incorrect or out of date information.
Examples from the post you referred to:
"Older bags and lovely vintage finds will be a bit more difficult since the serial number on the creed was not introduced until the late 1960's to early 1970's."
WRONG, Coach didn't start stamping serial numbers under the creeds until right around 1980 or maybe a year or two earlier. That's why NO Bonnie Cashin bags made during her partnership with Coach which ended in 1974 have serial numbers OR creeds
. Whateve can probably supply fairly close dates for those changes. It's hard to give exact dates, but even the glued-on serial numbers which were the first kind Coach used don't seem to have come into use until the late 1970s, and stamped creeds without numbers came in only a few years before that.
"
A switch in the format of the serial number came about in the late 80's. Where before it was "###-####" now they became "####-###."
NOT QUITE, the format was changed in 1990. And a few bags made around 1991-92 also use the older serial number format for some unknown reason.
The same blogger also posted authenticating information. Another mistake:
"
There is a misconception that the pattern must match at the seams. This is not true, what is true is that the pattern will always be centered."
WRONG, quite a few lines like the Signature Optics, Scarf prints, and even a few Sig Messengers and several others don't have centered C patterns. A few styles have centered Cs on the front but not the back.
Here's a 70077 Heritage Stripe Crossbody right from the old Drilldown that doesn't have a centered pattern, examples of this style can still be found on Ebay too,
View attachment 4334488
The Salearea Guides are accurate, up to date, and available at the top of every Coach Shopping forum index page. Please use those and not random internet "guides".