The Thunderbirds mixed booklet has M11L at top left, and MCIL at top right. Like all booklets of 6 these should see early and widespread use and should be found on mail and in kiloware by the end of January.
Wambrook climax rubber cancels, 1911 & 1922
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Wambrook had three different climax rubber cancels; below are examples of
the first (from 1911) and the third (from 1922). A second cancel is known
used...

I received a MNH single through the post on 5/1/11(not due until 11/1/11)so look for early used.
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