Crewkerne "230" Barred Numeral Duplex Cancels

Up to now I have generally held my postal history collection sorted by the town in the postmark, but recently I have started putting my material into order based on the type of postmark, for example Barred Numerals.  In doing this I have been identifying where I have gaps, some of which are fairly common postmarks.

One such gap was the "CREWKERNE / 230" 3-bar vertical oval duplex (3VOD) cancel with the time in code (as opposed to time in clear) as in the example below from 1896 which I have just acquired.

The cancel above was preceded by a 4-bar vertical oval duplex (4VOD) and followed by a 3-bar vertical oval duplex (3VOD) with the time in clear, as shown by the examples from 1873 and 1905 on the sheet below.