The late Bill Meredith of Northampton was working on this problem, using dated covers as a guide. Unfortunately, he died before he could publish any conclusions. I have a note in my "Wants" book that the 1.5d intermediate size was issued at the end of Nov 1934, but cannot remember where I got the original information from. I have no information on the 1d intermediate. Incidentally, the date for the 0.5d intermediate in the SG Specialised is wrong - it reads 17/11/1934 instead of 19/11/1934! Harvey
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