I believe the best source on this subject is Cancellation On the Postage Stamps of Ceylon by G.F.Oxley
It provides a detailed overview of each numeral and the associated village/town.
Perhaps a copy could be obtained by contacting the Ceylon Study Circle in the UK.
I have one and I can provide any specification information you may need. I also have about a 90% complete Ceylon QV numeral cancel collection on stamps and covers.
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