This has been discussed before.
viewtopic.php?f=20&t=6602&p=45811&hilit=baldwin+prototype&sid=943d6fc8628528331f58b0e9a446e24a#p45811As far as I'm aware, the only pictures that exist of these guitars are from film of The Shadows Australian Bandstand appearance of '67. There's no mention of them, I don't think, in either Paul Day's Burns Book or Per's Crazy Diamonds book. There are several mentions and pictures of the Marvin 'S' guitar (which was built by Baldwin for The Shads to use on another Australian tour in 1966) - but conversely no photo (that I've ever seen) of The Shadows or Hank playing them, which leads me to wonder whether they ever did. One of the green Marvin 'S' guitars came into Wout Steenhuis's ownership and appeared on the cover of one of his LPs and later Barry Gibson acquired it (I remember seeing it at a Pipeline Convention in the mid 90s).
Rock on!