Apologies for the delay. Managed to get hit by a car last week so been a little...out of it. Yes, Exeter mint of Aethelred's Last Small Cross. Moneyer is likely to be either Mangod, Thurgod or Isegod.
Have a look at the Fox brothers' work in the BNJ. Volumes 6, 7, 8, 9 & 10: Numismatic History of the Reigns of Edward I, II and III. e.g. Page 187 of this seminal work.
It's hard to prove based on the dies and other evidence we have, but 10cf is definitely one I take to be the start of Edward II's coinage if I were to be specific.
Don't get Vol. 1, get vol. 2 if you want Edward I & II. 11d isn't represented in Spink, either. It seems to just be different perspectives - perhaps 11d is seen as a 'mule' by some?
Each publication seems to differ. Class 11 is often used as the starting point for Edward II's reign (although untrue) there is still some debate regarding the chronological ordering of the classes (e.g. 6 & 7) and even some people who disagree with class 1b being termed a 'class' and not a pattern.