Hello - I found this discussion via a google search for "Cherifien post" and I see that nobody has mentioned the Alnis Guide to the Local Posts of Morocco. I have a few of these in my collection, and an assortment of the octagonal cachets from various cities/towns. I never knew what they were until I acquired the catalogue.
I just purchased the catalogue from a Canadian seller on eBay
. I was very disappointed to learn that it is not the original catalogue, but a xeroxed copy. Still, the book is out of lrint and very difficult to find, so if you just want the information - perhaps a copy would suffice. I found all of the stamps discussed here in the Alnis book ans they are priced as well.
The Alnis guide was published in 1993. It's really well done and I was able to identify the towns/cities of all 11 octagonal cachets I have... there are (clear) pictures of each along with the town name and catalogue numbers.
It's been three years since this thread was last touched, but I still wanted to add my two cents.