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fkwIve owned a couple of the Brush cards in the past but I cant remember if they were used. I think they were but I have no record of the postmark.
The best way to date them is to find some that were used with a postmark. You wouldnt want to say 1909... and then later find some postmarked 1908 and have to change the date again.
Id probably put 1908-10, unless you can find one postmarked.