DA only what? Though I suspect you are looking at an Enfield No 2, commonly mislabled as a Webley, and those cannot be converted back to DA/SA. Much harder to get parts for than a real Webley. DA only Webleys are virtually unknown. (found it, yep, that's an Enfield, you do not want that. the Webley just above it is much better.)
https://www.gunbroker.com/item/820232248This is a very good BIN price, especially with the extras. In Snowflake AZ.
The Webley MK IV is a Victorian match eligible revolver, as it is identical in form and function to a line of target gripped small frame Webleys that go back to the mid 1890s. The Enfield is not eligible for anything we do, unfortunatly.