Ilchester letter from Ilchester Gaol (with mileage mark) and Ilchester "399." 3-bar vertical oval cancel

Here is a letter written from Ilchester Gaol about an inmate who is being sued by a London wine merchant in June 1826.

This second item from Ilchester is addressed to Yeovil and has two "399." 3-bar vertical oval cancels (3VOS) and an "ILCHESTER" 20mm single ring dated November 1874.  This appears to be quite a lot earlier than previous recorded examples.