Can anyone help identify this valve?
This is a screw-on valve extension for a standard Sclaverand (aka Presta) valve. They are usually fitted when short valves are used with high rims. But here the 3 or so threads visible next to the rim indicate that it may not even be required. Screw it off and you'll find the normal valve-head underneath. If you have a track pump with a screw-on chuck it may fit nicely, with a lever action chuck it could be fiddly.