I thought that you'd happen upon the later post. What I failed to mention in that brief description though was that the lower seam on what I believe was the initial run of the first design version had small diameter (plastic?) piping (which also appeared on some prior pre-creed designs). This feature was eliminated early on, which is probably fortunate insofar as the material used for it did not age well and was prone to cracking, a problem that can be found in many of the surviving examples of the styles that had that feature.
Unfortunately, I haven't come across color charts for the early 1970s. I do though know that there were quite a few interesting colors options during those years. I've seen the first version of the Duffle Sac (which was produced during both the COACH metal tag and COACH cartouche imprint pre-creed periods) in saddle, mocha, putty, navy, burnt orange (precursor to British tan?) and an interesting forest green (that I have). I'm pretty sure that the palette changed and grew from year to year.