Yes, CTO, but (I think) done by hand and not printed. This is fairly common with this issue and also other Wurttemburg officials. Michel has a note about these at the head of the officials section and even illustrates this cancel. The CTO set is worth a few dollars retail, a postally used set much more. Scott only prices CTO/favor cancels, done in italics.
Here is another C.T.O. from Wurttemberg. This 50pf. stamp is from the last "government officials" set issued on March 25, 1920. It is a "last day" (March 31, 1920) cancel from this obviously philatelic set which was postally valid for only 7 days!