From the Burns' Site
For the Marvin historians, on what recordings did Hank use the Marvin Double Six?Double Six /64
The guitar to a large extent responsible for the British sound of the sixties. Used by The Searchers, Shadows, Troggs, as well as most other UK bands. It was also a favourite of Elvis'. Essentially, the guitar was a 12-string Marvin with TriSonic pick-ups and a simpler bridge. (1964-65).