The first one (Crook) is an 841 with a font variation (larger C than normal). There are some notations in the TnT catalog, but they don't exactly match my stamp, so I am not sure what type of 841 this is.
841 (O/C, 3) = the "3" refers to the footnote about the font variation, so that is ok. But the O/C means that one of the O's of Crook should be directly above the C of CO (Colorado). But clearly on this stamp, the state is further left than that, leaving CO centered under the first O of Crook.
841 (O/CO, 9, COOK) = the 9 refers to the misspelling COOK, which only happens in certain parts of the device, and obviously not on my stamp, so that is not an issue here. But O/CO means that the CO should be under an O, which is what I have on this stamp.
So which is this -- the first type of 841 because of the font or the second type because of the position of O/CO?
Did maybe the larger C just push the whole word further to the right, changing the positioning of CO?
THE next one for Dove Creek is unlisted - fake, post-cancel?
THE last two are likewise unlisted for Gilman. Also fakes/etc.?