VLBI Observations of a Complete Sample of Radio Galaxies. VIII. Proper Motion in 3C 338

We present new VLA, MERLIN and VLBI images for the radio galaxy 3C 338, and the results of the monitoring of its arcsecond core flux density. Present high sensitivity observations allow us to investigate the radio structure of this source and to confirm the presence of two symmetric parsec scale jets. Morphological changes between different epochs are evident and a proper motion with $eta sim$ 0.4h$^{-1}$ has been derived allowing us to give a lower limit constraint for the Hubble constant. While the steep spectrum large scale structure of 3C 338 could be a relic emission, the small scale structure looks young, similar to the high power MSOs found at high redshift.Comment: 12 pages, Figures included; Latex file aas2pp4.sty and amssym.sty included; Astrophysical Journal accepte