I only remember personally seeing specific records pressed at Archer going up into the 9000s. But that doesn't mean they didn't go into 10,000 and 11,000, because most of my records were released before 1968, and I have none that I know of, that were pressed at Archer after 1967. So, they likely move on to the 11,000s by, perhaps 1969 or 1970. (Which is precisely why I'd tend to lean towards the post Dynamics 1017 period for the Maxine Jenkins record, which should be late 1969 or, perhaps early 1970 (given that Dynamics' supposed run was from 1968 through 1969). If it were pressed before Dynamics 1011, I'd expect the Archer pressing number to be lower (perhaps in the 10,000s?). Unfortunately, the Anorak's Corner Pressing Plant Data lists Archer as a pressing plant, but provides no data on it, and no code numbers.
We had a very good informational thread on Soulful Detroit Forum in the early 2000s, which included pressing plant code numbers for various Detroit and Midwest plants (Archer included). But, I've looked for it, and failed to find it. A large percentage of the pre-2004 threads were lost when our co-founder and technical expert, Lowell Boileau, moved the SDF Archives from the old website to our current website (with much larger memory and storage capacity). Unfortunately, many of those pre-2004 threads had lots of information from posters such as Joe Hunter, Ron Murphy and other Detroit Music industry industry musicians, singers, label owners and record collectors who are now deceased. That valuable stockpile of information may be lost, forever.