Not to be negative, but it's far from the only one, not the oldest and not the most operationally complete.
We have two fully complete and working units - 1968 'Southern' (the oldest fully operational colour OB truck in the world) and 1967 'YTTTV' which is actually slightly older but carries operational cameras from 1959 to 1985 (as used at TV70). In addition, there's 'Project Vivat' which is a complete rebuild of a mid 1950s OB truck with already operational Marconi MkIII cameras. See
www.projectvivat.co.uk and attached pictures of 'Southern' and 'YTTV'.
There's also two 'new' ones now in the form of ex-Thames unit from 1966 and a BBC Type 5 - see pic of recently restored main monitor stack.
Best regards,
Paul M