A new version of the checklist is in preparation, and I'll make it available just as soon as I have all of the information and all of the stamps. That should be later this week or early next.
The new version will include all stamps issued or found up to the end of October.
Squared Circle cancels from Martock (1895) and Williton (1884)
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The Squared Circle cancel below from Martock in March 1895 was in use from
July 1881 to February 1914 ....
.... while the Williton squared circle cancel ...