There are special rules for Ceylon. Several stamps were printed from single plates, rather than separate key and duty plates, and yours appears to be one of them. Features of both dies are exhibited, but the quickest way to identify them is the large "c" in the value tablet. (Though in the case of the 6c, I think all the purples are single plates; the earlier 6c issues were various reds, and could be either single- or double-plate issues.)
Yours appears to be a 1922 issue (SG 343). Check for varieties in the watermark.
Robert, since you recognized the mix of die features, this won't be useful for you, but there are lots of new members who won't have seen my old Die I and Die II comparison thread.
Thanks, Cjd. I don't have a SG catalog--I use Scott. There is only one listing for a 6-cents violet KGV, Scott 231. Scott describes it as Die 1b, type II. (By the way, my stamp has wmk. 4, which matches Scott.) As there is only one listing under Scott, my stamp has to be 231. Does the Stanley Gibbons catalog list any other die varieties of the 6c violet?
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