Milverton

Two of the three handstamps in the BCC - only missing the "mileage erased" handstamp rarity Z !

 Milverton became a Railway Sub-Office (RSO) in 1874 and remained one until 1905 when RSOs were converted to either Sub-Offices or Post Towns.  The two cancels below from 1910 and 1913 still say "RSO".