I don't know doodly-squat but I'm betting it's a favor cancel - different from CTOs in that they are done in very small numbers as a favor, and not in bulk.
Well now, I can at least second guess what a "favor cancel" is but I don't have the foggiest of what a "remainder cancel" might be. Could you comment, Kim? Or someone else comment?
The cancel you illustrate (and its brother with upper and lower case lettering) was not generally used on mail, although I do have examples cancelling stamps on a registered letter to Russia and a few are known on postal stationery. What I can say for sure, is that the engraved and lithographed "large quetzal" issues, from the 5c type II up, carried this marking on the specimen stamps (and possibly postal stationery) sent to UPU for distribution to members around 1892 (= ca 600 copies of each stamp). I have full confirmation of this as I had the privilege of seeing the Guatemala UPU collection in Bern some years ago and such use is also confirmed by the specimen collections which have come on the market. When Guatemala participated in the US 1893 Exposition, it appears they sent several 1000 copies of each of the then current stamps, marked with the upper/lower case marking which is more elusive.
I would therefore describe them as office (or official) markings but not CTO, favor or even less remainder cancels as they are not common, but apparently do exist on stamps with full gum (I have none in this condition). They are collectible.
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