I can't really help with your mystery, but I suspect that your scan is representing a post-cancel (not a precancel) as the general rule would be that a precancel must have the city and state name fully visible within the width of the stamp. Even accounting for it being off center, it appears there is no way the entire city name of "Galveston" would fit on that stamp, thus, I'm thinking it is a post-cancel of some sort. Given that it is a postage due stamp, it would seem the local post office could have improvised any number of cancels for such a stamp.
Warrehouse: I'm more inclined to go with WT1's explanation as I don't think this is a normal cancel. I understand what you are saying - that this is the killer part of the postmark with the dial to the left. The suspicion lies in the fact that killer info usually denotes a station or branch, not a city and state. I've yet to see an example of one.
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