I was basing my supposition on the colors according to Ascher:
29 (1911): ultramarin -- a: mattultramarin -- b: mattviolett 33 (which Ascher has as 1916 rather than 1915): dunkelblau
The 1925 issue is too late to have been included in Ascher (published in 1925) and would also be too late for the cut square, if (as seems most likely) the 12 in the postmark means Taishô 12 (=1923).
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